Analysis
- max time kernel
89s - max time network
89s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
13/10/2022, 04:38
General
- Target file.exe
- Size 2.5MB
- Sample221013-e9dh7sahf3
- SHA256 54c1907b755ae2da92568d370729cd060c9593933b45647461836722d373dbff
Malware Config
Extracted
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nymaim
-
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
- 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-0QKFM.tmp\is-NSKRI.tmp"C:\Users\Admin\AppData\Local\Temp\is-0QKFM.tmp\is-NSKRI.tmp" /SL4 $60120 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2418166 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)\dwSearcher\dwsearcher47.exe"C:\Program Files (x86)\dwSearcher\dwsearcher47.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}\e0qOmbNhHM1v.exe4⤵
- Executes dropped EXE
-
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "dwsearcher47.exe" /f & erase "C:\Program Files (x86)\dwSearcher\dwsearcher47.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "dwsearcher47.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
dwsearcher47.exe
dwsearcher47.exe
is-NSKRI.tmp
is-NSKRI.tmp
e0qOmbNhHM1v.exe
dwsearcher47.exe
is-NSKRI.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
e0qOmbNhHM1v.exe
memory/1520-74-0x0000000003230000-0x0000000004470000-memory.dmp
memory/1520-70-0x0000000003230000-0x0000000004470000-memory.dmp
memory/1732-72-0x0000000000400000-0x0000000001640000-memory.dmp
memory/1732-73-0x0000000000400000-0x0000000001640000-memory.dmp
memory/1732-71-0x0000000000400000-0x0000000001640000-memory.dmp
memory/1732-75-0x0000000000400000-0x0000000001640000-memory.dmp
memory/1732-79-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1732-85-0x0000000000400000-0x0000000001640000-memory.dmp
memory/1976-65-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1976-54-0x0000000075CF1000-0x0000000075CF3000-memory.dmp
memory/1976-86-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1976-55-0x0000000000400000-0x0000000000414000-memory.dmp