Analysis
- max time kernel
112s - max time network
146s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
02/01/2023, 05:18
General
- Target file.exe
- Size 1.9MB
- Sample230102-fy9ypsde76
- SHA256 fbc8674d3bfdb736e17718f3a522f5d8d7270f92b110acf0a718d23430cf9d94
Malware Config
Extracted
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nymaim
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45.139.105.171
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85.31.46.167
Signatures
- NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
- Executes dropped EXE 3 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Drops file in Program Files directory 17 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-KB0JU.tmp\is-JRJ2B.tmp"C:\Users\Admin\AppData\Local\Temp\is-KB0JU.tmp\is-JRJ2B.tmp" /SL4 $1001D4 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1698805 931842⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Split Files\SplitFiles128.exe"C:\Program Files (x86)\Split Files\SplitFiles128.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\RxbbX.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles128.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles128.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles128.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
SplitFiles128.exe
SplitFiles128.exe
is-JRJ2B.tmp
is-JRJ2B.tmp
_iscrypt.dll
RxbbX.exe
RxbbX.exe
memory/4824-151-0x0000000000400000-0x000000000041D000-memory.dmp
memory/4824-132-0x0000000000400000-0x000000000041D000-memory.dmp
memory/4824-134-0x0000000000400000-0x000000000041D000-memory.dmp
memory/4824-156-0x0000000000400000-0x000000000041D000-memory.dmp
memory/5032-143-0x0000000000400000-0x0000000001552000-memory.dmp
memory/5032-142-0x0000000000400000-0x0000000001552000-memory.dmp
memory/5032-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/5032-152-0x0000000000400000-0x0000000001552000-memory.dmp
memory/5032-155-0x0000000000400000-0x0000000001552000-memory.dmp