Analysis
- max time kernel
59s - max time network
61s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
02/11/2022, 16:48
General
- Target file.exe
- Size 2.5MB
- Sample221102-va4jcachbj
- SHA256 9ccf29ac4bbd83b3eacb3f1d95c20e128a4c5a3c69670bfc798aa1d63f9e5bb4
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
- Loads dropped DLL 6 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 3 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 23 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-99H6L.tmp\is-6LO6O.tmp"C:\Users\Admin\AppData\Local\Temp\is-99H6L.tmp\is-6LO6O.tmp" /SL4 $60124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2352690 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)\flSearcher\flsearcher67.exe"C:\Program Files (x86)\flSearcher\flsearcher67.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Aa9qu4lvK.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "flsearcher67.exe" /f & erase "C:\Program Files (x86)\flSearcher\flsearcher67.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "flsearcher67.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
flsearcher67.exe
flsearcher67.exe
is-6LO6O.tmp
is-6LO6O.tmp
Aa9qu4lvK.exe
flsearcher67.exe
is-6LO6O.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
Aa9qu4lvK.exe
memory/1212-87-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1212-69-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1212-55-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1212-54-0x0000000075E11000-0x0000000075E13000-memory.dmp
memory/1400-71-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/1400-73-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/1400-72-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/1400-77-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1400-82-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/1400-83-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/1400-86-0x0000000000400000-0x00000000015A2000-memory.dmp
memory/1928-81-0x00000000030E0000-0x0000000004282000-memory.dmp
memory/1928-70-0x00000000030E0000-0x0000000004282000-memory.dmp