2390a715c7827fc20372394e4778ae24907b54bf1ac5827fde5fd76546a88fe4

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
12/01/2024, 08:37

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General

Target

55fcb1c3e617d513be6d8bd44d73e22a.dll
Size

35KB
MD5

55fcb1c3e617d513be6d8bd44d73e22a
SHA1

eade356482808b2f0bf45c0a98a96b13f1c96a30
SHA256

2390a715c7827fc20372394e4778ae24907b54bf1ac5827fde5fd76546a88fe4
SHA512

50e6a96f94ce62a43f64891678001f6899c4449a50f718d71add239a8ecf1ff3701aa3d3d6f8e4c67e2828d64b424535640a04fedf7c6ca567c7e99e98276a58
SSDEEP

768:/lQ8wbX7WLWfmqNLsku7IfrjzdRRS8azkfy/owttpItZYCT:FaCWfmq1CsfTaJsZYM

Score

7^/10

persistence upx

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
3292	rundll32.exe
3292	rundll32.exe
1588	rundll32.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3292-4-0x0000000010000000-0x0000000010021000-memory.dmp	upx
behavioral2/memory/3292-15-0x00000000008E0000-0x0000000000901000-memory.dmp	upx
behavioral2/memory/1588-25-0x0000000010000000-0x0000000010021000-memory.dmp	upx
behavioral2/memory/1588-26-0x0000000010000000-0x0000000010021000-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\\tuvULCRj.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{20D23232-AED6-490D-A3C2-F08BA539A1FE}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{20D23232-AED6-490D-A3C2-F08BA539A1FE}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{20D23232-AED6-490D-A3C2-F08BA539A1FE}\InprocServer32\ = "C:\\Windows\\SysWow64\\tuvULCRj.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{20D23232-AED6-490D-A3C2-F08BA539A1FE}\InprocServer32\ThreadingModel = "Both"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3292	rundll32.exe
3292	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe
1588	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3292	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3292	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3292	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 3292	2348	rundll32.exe	89
PID 2348 wrote to memory of 3292	2348	rundll32.exe	89
PID 2348 wrote to memory of 3292	2348	rundll32.exe	89
PID 3292 wrote to memory of 616	3292	rundll32.exe	5
PID 3292 wrote to memory of 1588	3292	rundll32.exe	103
PID 3292 wrote to memory of 1588	3292	rundll32.exe	103
PID 3292 wrote to memory of 1588	3292	rundll32.exe	103

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:616

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\55fcb1c3e617d513be6d8bd44d73e22a.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2348
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\55fcb1c3e617d513be6d8bd44d73e22a.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:3292
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\tuvULCRj.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:1588

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\tuvULCRj.dll

Filesize
35KB

MD5
55fcb1c3e617d513be6d8bd44d73e22a

SHA1
eade356482808b2f0bf45c0a98a96b13f1c96a30

SHA256
2390a715c7827fc20372394e4778ae24907b54bf1ac5827fde5fd76546a88fe4

SHA512
50e6a96f94ce62a43f64891678001f6899c4449a50f718d71add239a8ecf1ff3701aa3d3d6f8e4c67e2828d64b424535640a04fedf7c6ca567c7e99e98276a58

Download Submit
memory/1588-26-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/1588-25-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/1588-24-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/3292-3-0x0000000000640000-0x0000000000641000-memory.dmp

Filesize
4KB

Download
memory/3292-9-0x00000000008E0000-0x0000000000901000-memory.dmp

Filesize
132KB

Download
memory/3292-4-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/3292-10-0x00000000008E0000-0x0000000000901000-memory.dmp

Filesize
132KB

Download
memory/3292-13-0x00000000008E0000-0x0000000000901000-memory.dmp

Filesize
132KB

Download
memory/3292-14-0x0000000000910000-0x0000000000911000-memory.dmp

Filesize
4KB

Download
memory/3292-15-0x00000000008E0000-0x0000000000901000-memory.dmp

Filesize
132KB

Download
memory/3292-0-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/3292-2-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/3292-1-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download