73b73575c956610488e0c2b9c5676c2fd27e37a0b0519b6ae29fd09c72e3a8ab

Analysis

max time kernel
143s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
15/01/2024, 03:48

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General

Target

5c0e7f727e34fa05c53079d6c627ec4b.dll
Size

40KB
MD5

5c0e7f727e34fa05c53079d6c627ec4b
SHA1

ff9b5befa708f7b7787266c5e8c675a837351ff4
SHA256

73b73575c956610488e0c2b9c5676c2fd27e37a0b0519b6ae29fd09c72e3a8ab
SHA512

24ea894b3b8b00265d9f1018f4924e1b6aa7715f0bd7763515a469c6c571b3f7037fa2a2669d2b1e73264f63dbe83dc5f64e8252598b86afb13dc9b2e99801b8
SSDEEP

768:v5YiE+jL/zq8AjxiH/TCqUXWx3qylsVsQ4XrKjgbqJYf1U:vdE+PIMHG1XYHGWpmjeE3

Score

7^/10

persistence upx

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
1732	rundll32.exe
1732	rundll32.exe
5356	rundll32.exe

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1732-1-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1732-3-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1732-0-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1732-4-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1732-14-0x0000000000B20000-0x0000000000B34000-memory.dmp	upx
behavioral2/memory/5356-23-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/5356-24-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/5356-25-0x0000000010000000-0x0000000010014000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\MSServer = "rundll32.exe C:\\Windows\\system32\\wvUoLcyA.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FA1EDBD4-8003-4BBC-A1F1-E93A0FAC31BB}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FA1EDBD4-8003-4BBC-A1F1-E93A0FAC31BB}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FA1EDBD4-8003-4BBC-A1F1-E93A0FAC31BB}\InprocServer32\ = "C:\\Windows\\SysWow64\\wvUoLcyA.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FA1EDBD4-8003-4BBC-A1F1-E93A0FAC31BB}\InprocServer32\ThreadingModel = "Both"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1732	rundll32.exe
1732	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe
5356	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
1732	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1732	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1732	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1636 wrote to memory of 1732	1636	rundll32.exe	35
PID 1636 wrote to memory of 1732	1636	rundll32.exe	35
PID 1636 wrote to memory of 1732	1636	rundll32.exe	35
PID 1732 wrote to memory of 608	1732	rundll32.exe	87
PID 1732 wrote to memory of 5356	1732	rundll32.exe	101
PID 1732 wrote to memory of 5356	1732	rundll32.exe	101
PID 1732 wrote to memory of 5356	1732	rundll32.exe	101

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\5c0e7f727e34fa05c53079d6c627ec4b.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1636
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\5c0e7f727e34fa05c53079d6c627ec4b.dll,#1
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: RenamesItself
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1732
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\wvUoLcyA.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:5356

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:608

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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\wvUoLcyA.dll

Filesize
40KB

MD5
5c0e7f727e34fa05c53079d6c627ec4b

SHA1
ff9b5befa708f7b7787266c5e8c675a837351ff4

SHA256
73b73575c956610488e0c2b9c5676c2fd27e37a0b0519b6ae29fd09c72e3a8ab

SHA512
24ea894b3b8b00265d9f1018f4924e1b6aa7715f0bd7763515a469c6c571b3f7037fa2a2669d2b1e73264f63dbe83dc5f64e8252598b86afb13dc9b2e99801b8

Download Submit
memory/1732-1-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1732-2-0x00000000007E0000-0x00000000007E8000-memory.dmp

Filesize
32KB

Download
memory/1732-3-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1732-0-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1732-4-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1732-11-0x0000000000B20000-0x0000000000B34000-memory.dmp

Filesize
80KB

Download
memory/1732-14-0x0000000000B20000-0x0000000000B34000-memory.dmp

Filesize
80KB

Download
memory/5356-23-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/5356-24-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/5356-25-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download