Analysis
- max time kernel
57s - max time network
60s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
16/12/2022, 04:32
General
- Target file.exe
- Size 2.3MB
- Sample221216-e5yzcaeb33
- SHA256 867bf6803e12f01773dbb65b1d7b5c60110ffd0e74f13cdcd7454db16915e9bf
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 10 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 9 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 3 IoCs
- Suspicious use of WriteProcessMemory 35 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-K4H3J.tmp\is-4RCUF.tmp"C:\Users\Admin\AppData\Local\Temp\is-K4H3J.tmp\is-4RCUF.tmp" /SL4 $70124 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2156999 2088962⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\oaFolders.exe"C:\Program Files (x86)\PrintFolders\oaFolders.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}\9xXPW.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "oaFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\oaFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "oaFolders.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
oaFolders.exe
oaFolders.exe
is-4RCUF.tmp
is-4RCUF.tmp
9xXPW.exe
9xXPW.exe
oaFolders.exe
oaFolders.exe
oaFolders.exe
is-4RCUF.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
9xXPW.exe
9xXPW.exe
9xXPW.exe
memory/820-73-0x0000000003090000-0x00000000041FE000-memory.dmp
memory/820-90-0x0000000003090000-0x00000000041FE000-memory.dmp
memory/1284-93-0x0000000000400000-0x000000000156E000-memory.dmp
memory/1284-78-0x0000000000400000-0x000000000156E000-memory.dmp
memory/1284-76-0x0000000001C90000-0x0000000002DFE000-memory.dmp
memory/1284-75-0x0000000001C90000-0x0000000002DFE000-memory.dmp
memory/1284-97-0x0000000000400000-0x000000000156E000-memory.dmp
memory/1284-74-0x0000000000400000-0x000000000156E000-memory.dmp
memory/1284-77-0x0000000000400000-0x000000000156E000-memory.dmp
memory/1284-92-0x0000000001C90000-0x0000000002DFE000-memory.dmp
memory/1284-86-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1284-91-0x0000000000400000-0x000000000156E000-memory.dmp
memory/2012-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/2012-54-0x0000000074B51000-0x0000000074B53000-memory.dmp
memory/2012-72-0x0000000000400000-0x0000000000439000-memory.dmp
memory/2012-99-0x0000000000400000-0x0000000000439000-memory.dmp