Resubmissions
30-11-2023 10:51
231130-mx5qxsah79 1029-06-2023 20:59
230629-zs72psfa95 1029-06-2023 16:29
230629-tzp7ksec27 10Analysis
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max time kernel
150s -
max time network
30s -
platform
windows7_x64 -
resource
win7-20230621-en -
resource tags
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submitted
29-06-2023 16:29
General
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Target
medusa.exe
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Size
235KB
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MD5
f6f120d1262b88f79debb5d848ac7db9
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SHA1
1339282f9b2d2a41326daf3cf284ec2ae8f0f93c
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SHA256
1bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281
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SHA512
1067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd
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SSDEEP
6144:c5vMUmRTTgwnfeP+Jx1cLNAIyBcc9WrEWUC4wQh/6BeX:/U8Tgufnx1cLNncgQWUUQh/+e
Malware Config
Extracted
C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\HOW_TO_RECOVER_DATA.html
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 9 IoCs
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UAC bypass 3 TTPs 2 IoCs
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Renames multiple (281) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Modifies extensions of user files 6 IoCs
Ransomware generally changes the extension on encrypted files.
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Executes dropped EXE 1 IoCs
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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UPX packed file 11 IoCs
Detects executables packed with UPX/modified UPX open source packer.
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Checks whether UAC is enabled 1 TTPs 1 IoCs
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Drops desktop.ini file(s) 1 IoCs
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Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
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Suspicious behavior: EnumeratesProcesses 64 IoCs
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Suspicious use of AdjustPrivilegeToken 63 IoCs
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Suspicious use of WriteProcessMemory 28 IoCs
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System policy modification 1 TTPs 3 IoCs
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Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\medusa.exe"C:\Users\Admin\AppData\Local\Temp\medusa.exe"1⤵
- UAC bypass
- Modifies extensions of user files
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\taskeng.exetaskeng.exe {0CD7E597-E49E-4D13-84BA-37A24EA211DD} S-1-5-21-3518257231-2980324860-1431329550-1000:VWMLZJGN\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
4KB
MD52d8ba2ec1a0af5609c2165e1ac95c13e
SHA1a7ff54895e7747b5188a379f2430971d2538e8a6
SHA2566b3a5a37a18c2f378cf24aeebcbc3a4edfedc3a0b2db421df92996e532765594
SHA51281ba7d05af14322ad1c9bda60f1687fbaa23a2f24500fe8da6cdb684c0327c7e922c6a284a937e1b93d3bae1829d62e7738488367312d54c0de19a77aa1428ee
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Filesize
235KB
MD5f6f120d1262b88f79debb5d848ac7db9
SHA11339282f9b2d2a41326daf3cf284ec2ae8f0f93c
SHA2561bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281
SHA5121067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd
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Filesize
235KB
MD5f6f120d1262b88f79debb5d848ac7db9
SHA11339282f9b2d2a41326daf3cf284ec2ae8f0f93c
SHA2561bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281
SHA5121067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd
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Filesize
536B
MD5226637558ac3e9492fa296028f37d4da
SHA1b7cb5cae6dd9873dff3b57e7508999e6f276e4f7
SHA256038f1fa4e83340950555b73c9c648e99e4a5a53ab6fde439275286151a090032
SHA5120514bbff6c1c6463e7330b99d78a09390ce17738d32bc82ed57eae94d283729061834cb5fa7d127f86ea85dc95d310ae0d9d22614cad4eaf5de95df4e4fb57cb
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Filesize
712KB
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Filesize
712KB
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Filesize
712KB
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Filesize
712KB
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Filesize
712KB
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Filesize
712KB
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Filesize
712KB
-
Filesize
712KB
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Filesize
712KB