Analysis
- max time kernel
64s - max time network
66s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
07/01/2023, 01:01
General
- Target file.exe
- Size 1.9MB
- Sample230107-bc8rasfh2y
- SHA256 b6d98faf11cf6680d4c14c555a4441edd76bcfc9208e09d2a210be2e44028f64
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 17 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-QH6S3.tmp\is-EP65S.tmp"C:\Users\Admin\AppData\Local\Temp\is-QH6S3.tmp\is-EP65S.tmp" /SL4 $70022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1727556 967682⤵
- 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)\Split Files\PlitFiles132.exe"C:\Program Files (x86)\Split Files\PlitFiles132.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}\rrYWNh1tjQAuuE.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "PlitFiles132.exe" /f & erase "C:\Program Files (x86)\Split Files\PlitFiles132.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "PlitFiles132.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
PlitFiles132.exe
PlitFiles132.exe
is-EP65S.tmp
is-EP65S.tmp
rrYWNh1tjQAuuE.exe
rrYWNh1tjQAuuE.exe
PlitFiles132.exe
PlitFiles132.exe
PlitFiles132.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-EP65S.tmp
rrYWNh1tjQAuuE.exe
rrYWNh1tjQAuuE.exe
rrYWNh1tjQAuuE.exe
memory/988-73-0x00000000039C0000-0x0000000004B06000-memory.dmp
memory/1460-97-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1460-54-0x0000000074FB1000-0x0000000074FB3000-memory.dmp
memory/1460-55-0x0000000000400000-0x000000000041E000-memory.dmp
memory/1460-65-0x0000000000400000-0x000000000041E000-memory.dmp
memory/2012-74-0x0000000000400000-0x0000000001546000-memory.dmp
memory/2012-75-0x0000000001AC0000-0x0000000002C06000-memory.dmp
memory/2012-86-0x0000000000400000-0x0000000001546000-memory.dmp
memory/2012-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2012-91-0x0000000000400000-0x0000000001546000-memory.dmp
memory/2012-78-0x0000000000400000-0x0000000001546000-memory.dmp
memory/2012-77-0x0000000000400000-0x0000000001546000-memory.dmp
memory/2012-95-0x0000000000400000-0x0000000001546000-memory.dmp
memory/2012-76-0x0000000001AC0000-0x0000000002C06000-memory.dmp