Analysis
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max time kernel
147s -
max time network
146s -
platform
windows10-2004_x64 -
resource
win10v2004-20230621-en -
resource tags
arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system -
submitted
29-06-2023 16:31
Behavioral task
behavioral1
Sample
medusa4.exe
Resource
win7-20230621-en
Behavioral task
behavioral2
Sample
medusa4.exe
Resource
win10v2004-20230621-en
General
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Target
medusa4.exe
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Size
661KB
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MD5
19ddac9782acd73f66c5fe040e86ddee
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SHA1
24ceba1e2951cde8e41939da21c6ba3030fc531d
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SHA256
dde3c98b6a370fb8d1785f3134a76cb465cd663db20dffe011da57a4de37aa95
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SHA512
e7be7472241fdd26db48dbd0311afe821905f6d59dfb56e3dc035944b7346b0767a8af76d110c5f60c0ba0183ca3791e56d9b3c8b9ba887afa111aafc949c1d4
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SSDEEP
12288:vN3K5e8nbwFigzk6VVMqX8aQNRMcauV9B/rtiPnA40Q8:hCXbwFigzkQVdXvlcayDh49
Malware Config
Extracted
C:\Recovery\WindowsRE\HOW_TO_RECOVER_DATA.html
href="mailto:[email protected]">[email protected]</a><br>
href="mailto:[email protected]">[email protected]</a>
http-equiv="X-UA-Compatible"
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 2 IoCs
resource yara_rule behavioral2/files/0x0006000000023155-683.dat family_medusalocker behavioral2/files/0x0006000000023155-684.dat family_medusalocker -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" medusa4.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" medusa4.exe -
Renames multiple (183) 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 4 IoCs
Ransomware generally changes the extension on encrypted files.
description ioc Process File opened for modification C:\Users\Admin\Pictures\ApproveStart.tiff medusa4.exe File renamed C:\Users\Admin\Pictures\ApproveStart.tiff => C:\Users\Admin\Pictures\ApproveStart.tiff.encrypted medusa4.exe File renamed C:\Users\Admin\Pictures\ResumeWrite.raw => C:\Users\Admin\Pictures\ResumeWrite.raw.encrypted medusa4.exe File renamed C:\Users\Admin\Pictures\StepPush.crw => C:\Users\Admin\Pictures\StepPush.crw.encrypted medusa4.exe -
Executes dropped EXE 1 IoCs
pid Process 3176 svchostt.exe -
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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description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" medusa4.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\I: medusa4.exe File opened (read-only) \??\K: medusa4.exe File opened (read-only) \??\N: medusa4.exe File opened (read-only) \??\F: medusa4.exe File opened (read-only) \??\A: medusa4.exe File opened (read-only) \??\B: medusa4.exe File opened (read-only) \??\T: medusa4.exe File opened (read-only) \??\V: medusa4.exe File opened (read-only) \??\Z: medusa4.exe File opened (read-only) \??\E: medusa4.exe File opened (read-only) \??\L: medusa4.exe File opened (read-only) \??\S: medusa4.exe File opened (read-only) \??\Q: medusa4.exe File opened (read-only) \??\R: medusa4.exe File opened (read-only) \??\U: medusa4.exe File opened (read-only) \??\X: medusa4.exe File opened (read-only) \??\G: medusa4.exe File opened (read-only) \??\J: medusa4.exe File opened (read-only) \??\M: medusa4.exe File opened (read-only) \??\W: medusa4.exe File opened (read-only) \??\Y: medusa4.exe File opened (read-only) \??\H: medusa4.exe File opened (read-only) \??\O: medusa4.exe File opened (read-only) \??\P: medusa4.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe 4784 medusa4.exe -
Suspicious use of AdjustPrivilegeToken 22 IoCs
description pid Process Token: SeIncreaseQuotaPrivilege 5108 wmic.exe Token: SeSecurityPrivilege 5108 wmic.exe Token: SeTakeOwnershipPrivilege 5108 wmic.exe Token: SeLoadDriverPrivilege 5108 wmic.exe Token: SeSystemProfilePrivilege 5108 wmic.exe Token: SeSystemtimePrivilege 5108 wmic.exe Token: SeProfSingleProcessPrivilege 5108 wmic.exe Token: SeIncBasePriorityPrivilege 5108 wmic.exe Token: SeCreatePagefilePrivilege 5108 wmic.exe Token: SeBackupPrivilege 5108 wmic.exe Token: SeRestorePrivilege 5108 wmic.exe Token: SeShutdownPrivilege 5108 wmic.exe Token: SeDebugPrivilege 5108 wmic.exe Token: SeSystemEnvironmentPrivilege 5108 wmic.exe Token: SeRemoteShutdownPrivilege 5108 wmic.exe Token: SeUndockPrivilege 5108 wmic.exe Token: SeManageVolumePrivilege 5108 wmic.exe Token: 33 5108 wmic.exe Token: 34 5108 wmic.exe Token: 35 5108 wmic.exe Token: 36 5108 wmic.exe Token: SeAuditPrivilege 644 svchost.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 4784 wrote to memory of 5108 4784 medusa4.exe 82 PID 4784 wrote to memory of 5108 4784 medusa4.exe 82 PID 4784 wrote to memory of 5108 4784 medusa4.exe 82 -
System policy modification 1 TTPs 3 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" medusa4.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" medusa4.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" medusa4.exe -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\medusa4.exe"C:\Users\Admin\AppData\Local\Temp\medusa4.exe"1⤵
- UAC bypass
- Modifies extensions of user files
- Checks whether UAC is enabled
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4784 -
C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:5108
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k NetworkService -p -s LanmanWorkstation1⤵
- Suspicious use of AdjustPrivilegeToken
PID:644
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C:\Users\Admin\AppData\Roaming\svchostt.exeC:\Users\Admin\AppData\Roaming\svchostt.exe1⤵
- Executes dropped EXE
PID:3176
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
27KB
MD5299f80b0c0d2ec47c781003100486a74
SHA18fd2bb5dd08785d965e746fa25a2ba858998e5a4
SHA256c441c91600e9af0e9c4543d32db64e65091b1cc8cc213478ebf726f8f6edd80c
SHA5125299b895e33b37fcd322ce1ac3dd93a5213197251e77ce8aa4d1e66240c209593045e396188290c2150ab5abcc89814b31f00ed2d7a32ad975056ab37edbe46d
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Filesize
661KB
MD519ddac9782acd73f66c5fe040e86ddee
SHA124ceba1e2951cde8e41939da21c6ba3030fc531d
SHA256dde3c98b6a370fb8d1785f3134a76cb465cd663db20dffe011da57a4de37aa95
SHA512e7be7472241fdd26db48dbd0311afe821905f6d59dfb56e3dc035944b7346b0767a8af76d110c5f60c0ba0183ca3791e56d9b3c8b9ba887afa111aafc949c1d4
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Filesize
661KB
MD519ddac9782acd73f66c5fe040e86ddee
SHA124ceba1e2951cde8e41939da21c6ba3030fc531d
SHA256dde3c98b6a370fb8d1785f3134a76cb465cd663db20dffe011da57a4de37aa95
SHA512e7be7472241fdd26db48dbd0311afe821905f6d59dfb56e3dc035944b7346b0767a8af76d110c5f60c0ba0183ca3791e56d9b3c8b9ba887afa111aafc949c1d4