Analysis
- max time kernel
90s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
23/10/2022, 15:02
General
- Target file.exe
- Size 2.4MB
- Sample221023-sefa7sagh7
- SHA256 3c720ee161c13de4d8cf9a4727b639b876543dd2bb2c328b628ccd0bc5c96231
Malware Config
Extracted
-
nymaim
-
45.139.105.171
-
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
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\is-E0VJO.tmp\is-8EUNG.tmp"C:\Users\Admin\AppData\Local\Temp\is-E0VJO.tmp\is-8EUNG.tmp" /SL4 $70040 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2263046 527362⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\erSearcher\ersearcher57.exe"C:\Program Files (x86)\erSearcher\ersearcher57.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\kQrFt.exe4⤵
- Executes dropped EXE
-
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "ersearcher57.exe" /f & erase "C:\Program Files (x86)\erSearcher\ersearcher57.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /im "ersearcher57.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
-
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
ersearcher57.exe
ersearcher57.exe
_iscrypt.dll
is-8EUNG.tmp
is-8EUNG.tmp
kQrFt.exe
kQrFt.exe
memory/2144-156-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2144-138-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2144-132-0x0000000000400000-0x0000000000414000-memory.dmp
memory/4928-143-0x0000000000400000-0x00000000015F3000-memory.dmp
memory/4928-148-0x0000000010000000-0x000000001001B000-memory.dmp
memory/4928-152-0x0000000000400000-0x00000000015F3000-memory.dmp
memory/4928-144-0x0000000000400000-0x00000000015F3000-memory.dmp
memory/4928-142-0x0000000000400000-0x00000000015F3000-memory.dmp
memory/4928-155-0x0000000000400000-0x00000000015F3000-memory.dmp