Analysis
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max time kernel
128s -
max time network
125s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
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submitted
20-09-2024 23:09
General
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Target
20240920ed858a19f5881d5b4c1d291fc3c50bdecobaltstrikemedusalocker.exe
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Size
669KB
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MD5
ed858a19f5881d5b4c1d291fc3c50bde
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SHA1
2becf1d3b743ecf638568065aeb631653f69d003
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SHA256
f6e687b576ad52361379864e8065da6fb698df4ec6e0a1f664670229717eb230
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SHA512
7c6c83e63ff207b4957b58f076304724007b0b886388f07142264f516dfcda1d12f73ec8e71bba0cce6ed6d2a31d055c61f5df4bb95442bef88e9c16f1c57906
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SSDEEP
12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DOKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWnKrKe
Malware Config
Extracted
\Device\HarddiskVolume1\Boot\HOW_TO_BACK_FILES.html
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 1 IoCs
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UAC bypass 3 TTPs 2 IoCs
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Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Renames multiple (288) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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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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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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System Location Discovery: System Language Discovery 1 TTPs 7 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
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Interacts with shadow copies 3 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\20240920ed858a19f5881d5b4c1d291fc3c50bdecobaltstrikemedusalocker.exe"C:\Users\Admin\AppData\Local\Temp\20240920ed858a19f5881d5b4c1d291fc3c50bdecobaltstrikemedusalocker.exe"1⤵
- UAC bypass
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- System Location Discovery: System Language Discovery
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- System Location Discovery: System Language Discovery
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- System Location Discovery: System Language Discovery
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- System Location Discovery: System Language Discovery
- 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 {C1885F41-BA4E-4F4D-993E-61C2658F2877} S-1-5-21-457978338-2990298471-2379561640-1000:WOUOSVRD\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 v15
Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Direct Volume Access
1Impair Defenses
1Disable or Modify Tools
1Indicator Removal
2File Deletion
2Modify Registry
2Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
669KB
MD5ed858a19f5881d5b4c1d291fc3c50bde
SHA12becf1d3b743ecf638568065aeb631653f69d003
SHA256f6e687b576ad52361379864e8065da6fb698df4ec6e0a1f664670229717eb230
SHA5127c6c83e63ff207b4957b58f076304724007b0b886388f07142264f516dfcda1d12f73ec8e71bba0cce6ed6d2a31d055c61f5df4bb95442bef88e9c16f1c57906
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Filesize
536B
MD5bc4891aa7b38a63743a30b20c1a42bac
SHA1c0bfd7b8de4a0581be5a5142c260ee02b488f268
SHA25693c1be835fc6156ee4f63964ce7da4599ac3730fa3e94f30d7072b398bebb54a
SHA5126a3b4a35d17153b9659800e4ff2f17eede8a5b21d8e9823c3884eb0bc966b7367e58010161994307639be6f7a2d6bf925e18a8ea56e3cb06228a1723825ba295
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Filesize
4KB
MD5a0194e790cf3dc5517e9f17769ea853e
SHA1b6aa635c73277caecee2e2ae89a512480bc332c3
SHA2566f9299c47ad6c8e51e241b0ef725a63a81231eae735ad96d5df89f771f5d5971
SHA512958851c2ecd4ee21b43b3ac57189572ecfe1cc3ffa230847aa56aa40502fc60be4e0920b5bc831f04ae9dd6dc70906985a6aeaeb34c5a87dc81902557df98f7a