Analysis
- max time kernel
81s - max time network
113s - platform
windows10_x64 - resource
win10v20210408 - submitted
16/07/2021, 18:55
General
- Target 91dc35fa23a889bd9ef1e703e0f9eed7.exe
- Size 1.3MB
- Sample210716-ejg7y3rmdx
- SHA256 991cd470e36b51d3640eb6a1a40b6dbd54d2f82d6543fe38a46404bfc0a6bc76
Malware Config
Signatures
- Looks for VirtualBox Guest Additions in registry 2 TTPs
- Downloads MZ/PE file
- Looks for VMWare Tools registry key 2 TTPs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Loads dropped DLL 5 IoCs
- Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Maps connected drives based on registry 3 TTPs 2 IoCs
Disk information is often read in order to detect sandboxing environments.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 18 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\91dc35fa23a889bd9ef1e703e0f9eed7.exe"C:\Users\Admin\AppData\Local\Temp\91dc35fa23a889bd9ef1e703e0f9eed7.exe"1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\91dc35fa23a889bd9ef1e703e0f9eed7.exe"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\91dc35fa23a889bd9ef1e703e0f9eed7.exe"C:\Users\Admin\AppData\Local\Temp\91dc35fa23a889bd9ef1e703e0f9eed7.exe"2⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.execmd.exe /C timeout /T 10 /NOBREAK > Nul & Del /f /q "C:\Users\Admin\AppData\Local\Temp\91dc35fa23a889bd9ef1e703e0f9eed7.exe"3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /T 10 /NOBREAK4⤵
- Delays execution with timeout.exe
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/2496-137-0x0000000000400000-0x0000000000495000-memory.dmp
memory/2496-132-0x0000000000400000-0x0000000000495000-memory.dmp
memory/3628-120-0x0000000004BE0000-0x00000000050DE000-memory.dmp
memory/3628-125-0x000000000A2B0000-0x000000000A2B1000-memory.dmp
memory/3628-114-0x00000000001E0000-0x00000000001E1000-memory.dmp
memory/3628-123-0x00000000069C0000-0x0000000006A57000-memory.dmp
memory/3628-122-0x0000000007040000-0x000000000711B000-memory.dmp
memory/3628-121-0x0000000004620000-0x0000000004631000-memory.dmp
memory/3628-119-0x0000000004B50000-0x0000000004B51000-memory.dmp
memory/3628-118-0x0000000004C80000-0x0000000004C81000-memory.dmp
memory/3628-117-0x0000000004BE0000-0x0000000004BE1000-memory.dmp
memory/3628-116-0x00000000050E0000-0x00000000050E1000-memory.dmp
memory/3760-138-0x0000000007A30000-0x0000000007A31000-memory.dmp
memory/3760-140-0x0000000007DA0000-0x0000000007DA1000-memory.dmp
memory/3760-141-0x0000000007F00000-0x0000000007F01000-memory.dmp
memory/3760-142-0x0000000008180000-0x0000000008181000-memory.dmp
memory/3760-135-0x0000000007950000-0x0000000007951000-memory.dmp
memory/3760-134-0x0000000007920000-0x0000000007921000-memory.dmp
memory/3760-131-0x0000000000F62000-0x0000000000F63000-memory.dmp
memory/3760-130-0x0000000000F60000-0x0000000000F61000-memory.dmp
memory/3760-154-0x0000000008F60000-0x0000000008F93000-memory.dmp
memory/3760-161-0x0000000008F40000-0x0000000008F41000-memory.dmp
memory/3760-166-0x00000000090B0000-0x00000000090B1000-memory.dmp
memory/3760-167-0x000000007F2F0000-0x000000007F2F1000-memory.dmp
memory/3760-168-0x0000000009470000-0x0000000009471000-memory.dmp
memory/3760-129-0x00000000070D0000-0x00000000070D1000-memory.dmp
memory/3760-128-0x0000000004690000-0x0000000004691000-memory.dmp
memory/3760-215-0x0000000000F63000-0x0000000000F64000-memory.dmp
memory/3760-364-0x0000000009420000-0x0000000009421000-memory.dmp
memory/3760-370-0x0000000009410000-0x0000000009411000-memory.dmp