Analysis
- max time kernel
61s - max time network
64s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
19/10/2022, 03:32
General
- Target file.exe
- Size 2.4MB
- Sample221019-d3mb4aeed5
- SHA256 bc5aab9d2e0b916289bac67676eb7d3d931d06e6f3a620ea812659a0ba9e2d71
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-Q2JH5.tmp\is-UBBEV.tmp"C:\Users\Admin\AppData\Local\Temp\is-Q2JH5.tmp\is-UBBEV.tmp" /SL4 $7014C "C:\Users\Admin\AppData\Local\Temp\file.exe" 2267427 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}\Nx5s4ek59fss.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-UBBEV.tmp
is-UBBEV.tmp
Nx5s4ek59fss.exe
ehsearcher52.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-UBBEV.tmp
Nx5s4ek59fss.exe
memory/916-70-0x0000000003230000-0x0000000004428000-memory.dmp
memory/916-77-0x0000000003230000-0x0000000004428000-memory.dmp
memory/1000-65-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1000-55-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1000-54-0x0000000076561000-0x0000000076563000-memory.dmp
memory/1000-87-0x0000000000400000-0x0000000000414000-memory.dmp
memory/1192-71-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1192-78-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1192-79-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1192-83-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1192-73-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1192-86-0x0000000000400000-0x00000000015F8000-memory.dmp
memory/1192-72-0x0000000000400000-0x00000000015F8000-memory.dmp