a2b467e9ff18988aa8fafabcb7bd4a5e39681bb3dadb67712d495d8161066990

Analysis

max time kernel
167s
max time network
171s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
01-12-2022 20:18

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General

Target

a2b467e9ff18988aa8fafabcb7bd4a5e39681bb3dadb67712d495d8161066990.dll
Size

237KB
MD5

40f1491a53d7e464e7ebaae673ff7d75
SHA1

ae08ceae0588658a3145c6a5eba6b480ec0b4587
SHA256

a2b467e9ff18988aa8fafabcb7bd4a5e39681bb3dadb67712d495d8161066990
SHA512

e5006c07a25946292060fba6ad082216efcf345c2133cb24be6075f242d4f59f05484370985a5d8cc163491edfc8ac7074324ec774709cdaa2c0a77c87a21273
SSDEEP

3072:+8veZaeCGCpm6/VG4ko6l/ft17uAbmaFvek8q:+vZTNYmyVG4ko6lv7uu75

Score

10^/10

persistence

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\casozoh = "{4e2cb874-c6a4-1bf9-d7b5-c6a430fc6289}"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe

Loads dropped DLL 2 IoCs

pid	Process
4544	rundll32.exe
4544	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\pnfbmbu.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\pnfbmbu.dll	rundll32.exe
File created	C:\Windows\SysWOW64\bzrnyng.dll	rundll32.exe
File created	C:\Windows\SysWOW64\xvnjujc.dll	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4e2cb874-c6a4-1bf9-d7b5-c6a430fc6289}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4e2cb874-c6a4-1bf9-d7b5-c6a430fc6289}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4e2cb874-c6a4-1bf9-d7b5-c6a430fc6289}\InprocServer32\ = "C:\\Windows\\SysWow64\\xvnjujc.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4e2cb874-c6a4-1bf9-d7b5-c6a430fc6289}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4e2cb874-c6a4-1bf9-d7b5-c6a430fc6289}	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4544	rundll32.exe
4544	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4544	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4544	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 544 wrote to memory of 4544	544	rundll32.exe	81
PID 544 wrote to memory of 4544	544	rundll32.exe	81
PID 544 wrote to memory of 4544	544	rundll32.exe	81

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a2b467e9ff18988aa8fafabcb7bd4a5e39681bb3dadb67712d495d8161066990.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:544
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\a2b467e9ff18988aa8fafabcb7bd4a5e39681bb3dadb67712d495d8161066990.dll,#1
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:4544

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

C:\Windows\SysWOW64\bzrnyng.dll

Filesize
625KB

MD5
eccf28d7e5ccec24119b88edd160f8f4

SHA1
98509587a3d37a20b56b50fd57f823a1691a034c

SHA256
820c83c0533cfce2928e29edeaf6c255bc19ac9718b25a5656d99ffac30a03d6

SHA512
c1c94bbb781625b2317f0a8178d3a10d891fb71bca8f82cd831c484e8ab125301b82a14fe2ff070dc99a496cc00234300fa5536401018c40d49d44ae89409670

Download Submit
C:\Windows\SysWOW64\pnfbmbu.dll

Filesize
478KB

MD5
e99416267b61f52fa5ab994019efd359

SHA1
86d31eae707db7fe51d2556394fcf0e8e9f6b0fd

SHA256
768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774

SHA512
0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae

Download Submit
memory/4544-136-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/4544-137-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download