Analysis
- max time kernel
145s - max time network
142s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
21/11/2022, 02:02
General
- Target file.exe
- Size 2.4MB
- Sample221121-cf43ysfc6z
- SHA256 e6eef8b11f126ab4e60ae44ce18403e0616cfc2765c6a59a16c9d873f8bb21b2
Malware Config
Extracted
-
nymaim
-
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 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-ALDUT.tmp\is-KF3BF.tmp"C:\Users\Admin\AppData\Local\Temp\is-ALDUT.tmp\is-KF3BF.tmp" /SL4 $8005E "C:\Users\Admin\AppData\Local\Temp\file.exe" 2252416 3184642⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\guSearcher\gusearcher85.exe"C:\Program Files (x86)\guSearcher\gusearcher85.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\{6fe6a3c0-6208-11ed-b8c9-806e6f6e6963}\m4OYw.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "gusearcher85.exe" /f & erase "C:\Program Files (x86)\guSearcher\gusearcher85.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "gusearcher85.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
gusearcher85.exe
gusearcher85.exe
_iscrypt.dll
is-KF3BF.tmp
is-KF3BF.tmp
m4OYw.exe
m4OYw.exe
memory/3564-132-0x0000000000400000-0x0000000000455000-memory.dmp
memory/3564-155-0x0000000000400000-0x0000000000455000-memory.dmp
memory/3564-137-0x0000000000400000-0x0000000000455000-memory.dmp
memory/4704-143-0x0000000000400000-0x0000000001532000-memory.dmp
memory/4704-151-0x0000000000400000-0x0000000001532000-memory.dmp
memory/4704-147-0x0000000010000000-0x000000001001B000-memory.dmp
memory/4704-142-0x0000000000400000-0x0000000001532000-memory.dmp
memory/4704-154-0x0000000000400000-0x0000000001532000-memory.dmp