Analysis
- max time kernel
68s - max time network
71s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
19/10/2022, 02:34
General
- Target file.exe
- Size 2.4MB
- Sample221019-c2f81sfadn
- SHA256 a7b54d20b35c4d7861ba3cf09d7b3a4080531be41fa9b3a0d7e50f50c44860fb
Malware Config
Extracted
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nymaim
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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-VP5CT.tmp\is-3BG9E.tmp"C:\Users\Admin\AppData\Local\Temp\is-VP5CT.tmp\is-3BG9E.tmp" /SL4 $60120 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2279441 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)\ehSearcher\ehsearcher52.exe"C:\Program Files (x86)\ehSearcher\ehsearcher52.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}\aO5T0PdQjM4L.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "ehsearcher52.exe" /f & erase "C:\Program Files (x86)\ehSearcher\ehsearcher52.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "ehsearcher52.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
ehsearcher52.exe
ehsearcher52.exe
is-3BG9E.tmp
is-3BG9E.tmp
aO5T0PdQjM4L.exe
ehsearcher52.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-3BG9E.tmp
aO5T0PdQjM4L.exe
memory/1388-87-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1388-54-0x00000000768A1000-0x00000000768A3000-memory.dmp
memory/1388-55-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1388-65-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1472-70-0x0000000003220000-0x0000000004418000-memory.dmp
memory/1472-74-0x0000000003220000-0x0000000004418000-memory.dmp
memory/1796-75-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1796-79-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1796-83-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1796-73-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1796-72-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1796-86-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1796-71-0x0000000000400000-0x00000000015F8000-memory.dmp