Analysis
- max time kernel
77s - max time network
85s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
19/11/2022, 18:47
General
- Target file.exe
- Size 2.4MB
- Sample221119-xe665sfa57
- SHA256 f81d857486983de15138e846bbe0de8bf4cd2dd76ebef9136365336a46cbda84
Malware Config
Extracted
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nymaim
-
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-DRVTV.tmp\is-TK14I.tmp"C:\Users\Admin\AppData\Local\Temp\is-DRVTV.tmp\is-TK14I.tmp" /SL4 $70122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2244910 3184642⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\gtSearcher\gtsearcher84.exe"C:\Program Files (x86)\gtSearcher\gtsearcher84.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}\lU2gfsEbztf4Ym.exe4⤵
- Executes dropped EXE
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "gtsearcher84.exe" /f & erase "C:\Program Files (x86)\gtSearcher\gtsearcher84.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "gtsearcher84.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
gtsearcher84.exe
gtsearcher84.exe
is-TK14I.tmp
is-TK14I.tmp
lU2gfsEbztf4Ym.exe
gtsearcher84.exe
is-TK14I.tmp
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
lU2gfsEbztf4Ym.exe
memory/1352-69-0x0000000003260000-0x0000000004396000-memory.dmp
memory/1352-77-0x0000000003260000-0x0000000004396000-memory.dmp
memory/1760-70-0x0000000000400000-0x0000000001536000-memory.dmp
memory/1760-73-0x0000000000400000-0x0000000001536000-memory.dmp
memory/1760-72-0x0000000000400000-0x0000000001536000-memory.dmp
memory/1760-78-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1760-82-0x0000000000400000-0x0000000001536000-memory.dmp
memory/1760-85-0x0000000000400000-0x0000000001536000-memory.dmp
memory/2020-54-0x0000000075451000-0x0000000075453000-memory.dmp
memory/2020-60-0x0000000000400000-0x0000000000455000-memory.dmp
memory/2020-86-0x0000000000400000-0x0000000000455000-memory.dmp
memory/2020-55-0x0000000000400000-0x0000000000455000-memory.dmp