Analysis
- max time kernel
90s - max time network
126s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
17/10/2022, 14:02
General
- Target file.exe
- Size 2.3MB
- Sample221017-rb5k9acbfr
- SHA256 2fefef1b0c64e6895e4b83bb760e4eabc0250b054fa68ad189c5610ae55c2804
Malware Config
Extracted
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nymaim
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45.15.156.54
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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 12 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-GI98C.tmp\is-AUTI0.tmp"C:\Users\Admin\AppData\Local\Temp\is-GI98C.tmp\is-AUTI0.tmp" /SL4 $601F6 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2148439 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\efSearcher\efsearcher51.exe"C:\Program Files (x86)\efSearcher\efsearcher51.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}\S4oITu0p27kr.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "efsearcher51.exe" /f & erase "C:\Program Files (x86)\efSearcher\efsearcher51.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "efsearcher51.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
efsearcher51.exe
efsearcher51.exe
is-AUTI0.tmp
is-AUTI0.tmp
_iscrypt.dll
S4oITu0p27kr.exe
S4oITu0p27kr.exe
memory/856-155-0x0000000000400000-0x0000000000414000-memory.dmp
memory/856-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/856-137-0x0000000000400000-0x0000000000414000-memory.dmp
memory/5112-143-0x0000000000400000-0x00000000015C6000-memory.dmp
memory/5112-151-0x0000000000400000-0x00000000015C6000-memory.dmp
memory/5112-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/5112-142-0x0000000000400000-0x00000000015C6000-memory.dmp
memory/5112-154-0x0000000000400000-0x00000000015C6000-memory.dmp