b299d0d4e6af3eb7c2f432459870bbd9a2bee2c8bb38c71f913fd69cf3682f5b

Analysis

max time kernel
148s
max time network
170s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
07/11/2022, 19:42

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General

Target

b299d0d4e6af3eb7c2f432459870bbd9a2bee2c8bb38c71f913fd69cf3682f5b.dll
Size

236KB
MD5

0a5fc17a73b891131cee72f9fcfda4dc
SHA1

161cc4ced4339486bd0e011a759439d96e6077ec
SHA256

b299d0d4e6af3eb7c2f432459870bbd9a2bee2c8bb38c71f913fd69cf3682f5b
SHA512

3e9a8433bc7d0ed853763162f32fedd83a5d4d303c10e535da62b805929bdb939af7570fe741740deb7b4a1b5e7cc363ef11a25d55b96cfdc18942f4dab081bf
SSDEEP

1536:Iguo2K86vta10RJQYPIHL+D5IWhxRh/Ci4ucg3/+k5ltr+DRPG8Gz7wk+cQvM+:Go256vS0RJAL+lHPKi40+66iwkD05

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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\fxkdw = "{5f2de942-d7a5-2cfa-e8b6-d7a561cafa12}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
1684	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\skxqj.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\skxqj.dll	rundll32.exe
File created	C:\Windows\SysWOW64\asfyr.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\asfyr.dll	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5f2de942-d7a5-2cfa-e8b6-d7a561cafa12}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5f2de942-d7a5-2cfa-e8b6-d7a561cafa12}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5f2de942-d7a5-2cfa-e8b6-d7a561cafa12}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5f2de942-d7a5-2cfa-e8b6-d7a561cafa12}\InprocServer32\ = "C:\\Windows\\SysWow64\\asfyr.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5f2de942-d7a5-2cfa-e8b6-d7a561cafa12}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1684	rundll32.exe
1684	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1684	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1684	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4344 wrote to memory of 1684	4344	rundll32.exe	82
PID 4344 wrote to memory of 1684	4344	rundll32.exe	82
PID 4344 wrote to memory of 1684	4344	rundll32.exe	82

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b299d0d4e6af3eb7c2f432459870bbd9a2bee2c8bb38c71f913fd69cf3682f5b.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4344
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b299d0d4e6af3eb7c2f432459870bbd9a2bee2c8bb38c71f913fd69cf3682f5b.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:1684

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\skxqj.dll

Filesize
478KB

MD5
e99416267b61f52fa5ab994019efd359

SHA1
86d31eae707db7fe51d2556394fcf0e8e9f6b0fd

SHA256
768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774

SHA512
0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae

Download Submit
memory/1684-133-0x00000000010B0000-0x00000000010F4000-memory.dmp

Filesize
272KB

Download
memory/1684-135-0x00000000010B0000-0x00000000010F4000-memory.dmp

Filesize
272KB

Download
memory/1684-136-0x00000000010B0000-0x00000000010F4000-memory.dmp

Filesize
272KB

Download