Update 5: Information on MOVEit Vulnerabilities CVE-2023-34362, CVE-2023-35036, CVE-2023-35708, and CVE-2023-36934

Sophos X-Ops is tracking the developing situation around SQL injection vulnerabilities affecting MOVEit Transfer and MOVEit Cloud. The vulnerabilities related to this are CVE-2023-34362, CVE-2023-35036, CVE-2023-35708, CVE-2023-36932, CVE-2023-36933, and CVE-2023-36934.

This post provides a situation overview and guidance from SophosLabs and Sophos MDR. We will update this page as events and understanding, including our threat and detection guidance, develop.

[Version 6 [Update 5] published 21:55 UTC, 7 July 2023 to add information on three new vulnerabilities (CVE-2023-36932, CVE-2023-36933, CVE-2023-36934) and Progress’ new service-pack update model.

Version 5 [Update 4] published 20:25 UTC, 16 June 2023 to add CVE number (CVE-2023-35708) for third vulnerability and to state that MOVEit has a patch available.

Version 4 [Update 3] published 8:00 UTC, 16 June 2023 to include information from MOVEit on a third vulnerability, newly disclosed.

Version 3 [Update 2] published 20:30 UTC, 9 June 2023 to include information from MOVEit about newest patch and guidance, including notice of a second vulnerability (CVE-2023-35036).

Version 2 [Update 1] published 23:30 UTC, 6 June 2023 adding “Determining Impact with Sophos XDR” section providing datalake query and updating information on number and diversity of attacks as well as IIS log traces.

Initially posted at 22:43 UTC on 5 June 2023]

Situation Overview

UPDATED GUIDANCE: On July 5, 2023, Progress announced that they have formalized a service-pack-style update system for all MOVEit products. The first service pack, which was published at the time of the update, included fixes for three vulnerabilities discovered in older versions of MOVEit Transfer.

As of June 15, 2023, Progress released a third patch and advisory material after a new vulnerability was disclosed. More information on CVE-2023-35708 is available at the link.

As of June 9, 2023, Progress released a NEW patch. All MOVEit customers should apply this new patch as directed.

On May 31, 2023, Progress Software released a patch for CVE-2023-34362, a SQL injection vulnerability that could enable attackers to gain complete control over a MOVEit installation. (MOVEit is compliance-aware secure file transfer and automation software.) With this level of access, attackers could alter or steal data, install malicious software such as web shells, and/or alter the configuration of the server (including creating new accounts or altering existing ones), among other actions.

As discussed in the Progress advisory for on-premises customers, all MOVEit on-premises customers should apply the mitigations discussed in the advisory as soon as possible and deploy the patch as soon as possible after that. MOVEit cloud customers should read and follow the guidance in the Progress advisory for cloud customers.

Public reports indicate that attacks against this vulnerability were true “zero-day attacks” and may have begun as early as May 27, 2023 — before a patch was available or the vulnerability publicly disclosed or discussed.

These reports also indicate that known attacks against this vulnerability have focused on creating web shells on vulnerable systems and using that access to steal data from compromised systems.

On June 4, 2023, Microsoft Threat Intelligence attributed these attacks to “Lace Tempest,” which is “known for ransomware operations & running the Cl0p extortion site.” Lace Tempest is also tracked in the industry as FIN11, DEV-0950, and TA505.

Currently SophosLabs and MDR are seeing a very low number of attacks; however, the victims are diverse in both geography and sector. This correlates with the findings of other security vendors. In addition, the earliest Sophos observed exploitation occurred on May 27, 2023, four days prior to the public notification by Progress Software.

Sophos can also confirm that a key indicator of successful post-exploitation is the presence of a web shell: c:MOVEit Transferwwwroothuman2.aspx. Below, in Figure 1, is an example of an attack and the follow-on web shell traffic as recorded in the IIS logs.

Figure 1: Attack in progress

Sophos products currently detect and protect against this web shell as Troj/WebShel-GO.

An additional indicator of exploitation is “App_Web_<Random8chars>.dll” generated by csc.exe compiler, which is spawned by the w3wp.exe parent process. This dll file contains the SQL injection commands, as well as the hard-coded web shell, and is likewise detected by Sophos products as Troj/WebShel-GO. All MOVEit customers should follow the steps outlined in the “Guidance” section below.

Of particular note: Since attacks began before a patch was available, all MOVEit customers should check for signs of compromise beyond those publicly discussed, as attacks could have happened before patching using methods not yet publicly identified. Also, it’s important to note that patching will NOT remove any web shells or other artifacts of compromise. This makes it critical that MOVEit customers include a check for compromise after deploying patches IN ADDITION TO deploying patches. Patching alone is NOT sufficient.


MOVEit on-premises customers: Apply the mitigations discussed in the advisory as soon as possible and deploy the patch as soon as possible after that, as directed in the guidance for Progress advisory for on-premises customers.
MOVEit cloud customers: Read and follow the guidance in the Progress advisory for cloud customers.
All MOVEit customers: Check for signs of malicious activity and take appropriate remediation action if such activity is detected.

Determining Impact with Sophos XDR

The below datalake query may be executed to review any csc.exe compiler activity related to MOVEit, which can indicate exploit attempts. Please note there will be benign activity also returned with this query, as this behavior also occurs during the software update process.

date_format(from_unixtime(time), ‘%Y-%m-%d %H:%i:%S’) as date_time,
query_name = ‘running_processes_windows_sophos’
AND LOWER(parent_name) = ‘w3wp.exe’
AND LOWER(name) = ‘csc.exe’
AND LOWER(parent_cmdline) LIKE ‘%moveitdmz%’

If the above query yields suspicious activity about which you would like additional details, the below query can be executed to provide deeper insight on the process. You will need to generate a variable ‘$$sophos_pid$$’ and enter the Sophos Process ID from the prior query. Similar to the first query, this may return benign results as well that require human analysis.

STRFTIME(‘%Y-%m-%d %H:%M:%S’,
DATETIME(sophos_process_activity.time, ‘unixepoch’))
AS utc_time,
LEFT JOIN sophos_process_journal AS process_journal
ON process_journal.sophos_pid = sophos_process_activity.sophos_pid
ON users.uuid LIKE process_journal.sid
sophos_process_activity.sophos_pid = ‘$$sophos_pid$$’
AND sophos_process_activity.action = ‘Created’
AND sophos_process_activity.object LIKE ‘%.dll’

Lastly, if you do have IIS log files available, the following query can be used to search for web shell activity. You will need to generate a variable, ‘$$log_path$$’ and enter the file path to the IIS log that you would like to review.

WITH sorter AS (
WITH content AS
–Split the raw log into sortable columns
— Grab data from the IIS logs, removing comment lines and limiting returned line count to ensure functionality
FROM file
CROSS JOIN grep ON (grep.path = file.path)
file.path LIKE ‘$$log_path$$’
grep.pattern = ‘POST /api/v1/token’
OR grep.pattern = ‘POST /guestaccess.aspx’
OR grep.pattern = ‘GET /human2.aspx’
OR grep.pattern = ‘GET /api/v1/folders’
CAST(SPLIT(line,’ ‘,0) AS TEXT) AS iis_date,
CAST(SPLIT(line,’ ‘,1) AS TEXT) AS iis_time,
SPLIT(line,’ ‘,2) AS source_ip,
SPLIT(line,’ ‘,3) AS cs_method,
SPLIT(line,’ ‘,4) AS cs_uri_stem,
SPLIT(line,’ ‘,5) AS cs_uri_query,
SPLIT(line,’ ‘,6) AS source_port,
SPLIT(line,’ ‘,7) AS cs_username,
SPLIT(line,’ ‘,8) AS remote_ip,
SPLIT(line,’ ‘,9) AS user_agent,
SPLIT(line,’ ‘,10) AS referer,
SPLIT(line,’ ‘,11) AS status,
SPLIT(line,’ ‘,12) AS substatus,
SPLIT(line,’ ‘,13) AS win32status,
SPLIT(line,’ ‘,14) AS timetaken
FROM content
WHERE iis_date NOT LIKE ‘#%’
–CAST(MIN(datetime(iis_date ‘ ‘

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