2f712ebbf0f4316d130a63c43e5d5fcb571f4c6bb839f535c140f85992b4797d

Analysis

max time kernel
135s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
12/04/2023, 07:50

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General

Target
4c3499f3cc4a4fdc7e67417e055891c78540282dccc57e37a01167dfe351b244.dll
Size 453KB
Sample230412-jplfjacd2s
SHA256 4c3499f3cc4a4fdc7e67417e055891c78540282dccc57e37a01167dfe351b244
MD5 56018500f73e3f6cf179d3b853c27912
SHA1 a3060a3efb9ac3da444ef8abc99143293076fe32
SHA512 730586717c13d19c4141ce1b44a6e91bcfe4deac8c99eb438d452c965c0b5adac4b2b68da04ad6abc6900bcc410d1801e448831903a8265f3b370896434d8f8e
SSDEEP 12288:BJWFxerI6z4GrTyPy2ROqz/sC670ahgA6:BJWuIE4Gr2PX5UCs0a
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

persistence

Malware Config

Signatures

Blocklisted process makes network request 4 IoCs

flow	pid	Process
2	2656	rundll32.exe
7	2656	rundll32.exe
35	2656	rundll32.exe
43	2656	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
2656	rundll32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OneDrive Update = "C:\\\\Windows\\\\System32\\\\rundll32.exe C:\\\\ProgramData\\\\VMware\\\\vmnat-update.bin,OCSP_resp_find lxUi5CZ0IV45j89Y 4901"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1224	rundll32.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1224 wrote to memory of 2656	1224	rundll32.exe	83
PID 1224 wrote to memory of 2656	1224	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\4c3499f3cc4a4fdc7e67417e055891c78540282dccc57e37a01167dfe351b244.dll,CMS_dataFinal Bx9yb37GEcJNK6bt 4901
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1224
- C:\Windows\System32\rundll32.exe
  C:\\Windows\\System32\\rundll32.exe C:\\ProgramData\\VMware\\vmnat-update.bin,OCSP_resp_find lxUi5CZ0IV45j89Y 4901
  2⤵
  - Blocklisted process makes network request
  - Loads dropped DLL
  PID:2656

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

vmnat-update.bin

Path C:\ProgramData\VMware\vmnat-update.bin
Size 512KB
SHA256 a75886b016d84c3eaacaf01a3c61e04953a7a3adf38acf77a4a2e3a8f544f855
MD5 f5475608c0126582081e29927424f338
SHA1 8e88fd82378794a17a4211fbf2ee2506b9636b02
SHA512 b47eb6b6d22ce249a8661daf576af2fcc4d5eeae78a48ff1fda4bc4816b7b4d12c40211b716cec372f7b7b5bd4878efa1a9cf7e54dbbf6cb878065abb0d4e05a
SSDEEP 12288:g98vjkhX1I8joW/LNeWUvpaic7IJiMWz6G6:O/hX15fjNDisd7MWmG
MD5 SHA1 SHA512 SSDEEP

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vmnat-update.bin

Path C:\ProgramData\VMware\vmnat-update.bin
Size 512KB
SHA256 a75886b016d84c3eaacaf01a3c61e04953a7a3adf38acf77a4a2e3a8f544f855
MD5 f5475608c0126582081e29927424f338
SHA1 8e88fd82378794a17a4211fbf2ee2506b9636b02
SHA512 b47eb6b6d22ce249a8661daf576af2fcc4d5eeae78a48ff1fda4bc4816b7b4d12c40211b716cec372f7b7b5bd4878efa1a9cf7e54dbbf6cb878065abb0d4e05a
SSDEEP 12288:g98vjkhX1I8joW/LNeWUvpaic7IJiMWz6G6:O/hX15fjNDisd7MWmG
MD5 SHA1 SHA512 SSDEEP

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memory/2656-136-0x0000000180000000-0x00000001800AF000-memory.dmp

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