Analysis
- max time kernel
65s - max time network
68s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
25/10/2022, 06:02
General
- Target file.exe
- Size 2.2MB
- Sample221025-grflysbfhr
- SHA256 e5327c5eecaca260216af2aeac888ddbd45e4f40d2ad5d770cf876003377fb36
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-MT2N5.tmp\is-VPEK0.tmp"C:\Users\Admin\AppData\Local\Temp\is-MT2N5.tmp\is-VPEK0.tmp" /SL4 $D0152 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2007473 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)\evSearcher\evsearcher59.exe"C:\Program Files (x86)\evSearcher\evsearcher59.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}\hNUf3QYfeZ1.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "evsearcher59.exe" /f & erase "C:\Program Files (x86)\evSearcher\evsearcher59.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "evsearcher59.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
evsearcher59.exe
evsearcher59.exe
is-VPEK0.tmp
is-VPEK0.tmp
hNUf3QYfeZ1.exe
evsearcher59.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-VPEK0.tmp
hNUf3QYfeZ1.exe
memory/368-83-0x0000000000400000-0x0000000001519000-memory.dmp
memory/368-86-0x0000000000400000-0x0000000001519000-memory.dmp
memory/368-70-0x0000000000400000-0x0000000001519000-memory.dmp
memory/368-71-0x0000000000400000-0x0000000001519000-memory.dmp
memory/368-73-0x0000000000400000-0x0000000001519000-memory.dmp
memory/368-79-0x0000000010000000-0x000000001001B000-memory.dmp
memory/368-75-0x0000000000400000-0x0000000001519000-memory.dmp
memory/2032-65-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2032-54-0x0000000075A71000-0x0000000075A73000-memory.dmp
memory/2032-87-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2032-55-0x0000000000400000-0x0000000000414000-memory.dmp
memory/2044-74-0x00000000030E0000-0x00000000041F9000-memory.dmp
memory/2044-69-0x00000000030E0000-0x00000000041F9000-memory.dmp