Analysis
- max time kernel
61s - max time network
62s - platform
windows7_x64 - resource
win7-20220812-en - resource tags
- submitted
14/12/2022, 23:31
General
- Target file.exe
- Size 2.3MB
- Sample221214-3hpddsbd56
- SHA256 37be16b155fe766725b8e85ccd82a9e971266fb2df6fa46ae55696fd6d43e584
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 9 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-C8SLG.tmp\is-MBEN7.tmp"C:\Users\Admin\AppData\Local\Temp\is-C8SLG.tmp\is-MBEN7.tmp" /SL4 $80126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2161149 2088962⤵
- 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)\PrintFolders\nyFolders.exe"C:\Program Files (x86)\PrintFolders\nyFolders.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}\dhrzd5PuU.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "nyFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nyFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "nyFolders.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
nyFolders.exe
nyFolders.exe
is-MBEN7.tmp
is-MBEN7.tmp
dhrzd5PuU.exe
dhrzd5PuU.exe
nyFolders.exe
nyFolders.exe
nyFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-MBEN7.tmp
dhrzd5PuU.exe
dhrzd5PuU.exe
dhrzd5PuU.exe
memory/1644-86-0x0000000000400000-0x0000000001564000-memory.dmp
memory/1644-92-0x0000000001B10000-0x0000000002C74000-memory.dmp
memory/1644-77-0x0000000000400000-0x0000000001564000-memory.dmp
memory/1644-78-0x0000000000400000-0x0000000001564000-memory.dmp
memory/1644-75-0x0000000001B10000-0x0000000002C74000-memory.dmp
memory/1644-73-0x0000000000400000-0x0000000001564000-memory.dmp
memory/1644-97-0x0000000000400000-0x0000000001564000-memory.dmp
memory/1644-93-0x0000000000400000-0x0000000001564000-memory.dmp
memory/1644-76-0x0000000001B10000-0x0000000002C74000-memory.dmp
memory/1644-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/1776-91-0x00000000030B0000-0x0000000004214000-memory.dmp
memory/1776-70-0x00000000030B0000-0x0000000004214000-memory.dmp
memory/1980-55-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1980-68-0x0000000000400000-0x0000000000439000-memory.dmp
memory/1980-54-0x0000000075831000-0x0000000075833000-memory.dmp
memory/1980-99-0x0000000000400000-0x0000000000439000-memory.dmp