61490446a4c73c0e85489d8bd18a566075894f9c1de1d6b4fe2ec86b0dc064d4

Analysis

max time kernel
150s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
06-01-2024 21:49

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General

Target

473f90bb310e80a9ebf912c656f85dcd.dll
Size

40KB
MD5

473f90bb310e80a9ebf912c656f85dcd
SHA1

2aac00f46d182b99165aeda2a7c9a03c02c0116e
SHA256

61490446a4c73c0e85489d8bd18a566075894f9c1de1d6b4fe2ec86b0dc064d4
SHA512

6c7c167c79191825ecee23bef68c0dc2077e9d6271b1ef22d27b9c0d013faba50451bb258ddc0598d79e68dafa972be932d57b96732285552329ed732ed28688
SSDEEP

768:ChED+L0si9F771dUEzT/C9tmoL4jazCoonB5u8rBlVt8:ChED+L677jG9YoL4LoU79BlVt8

Score

7^/10

persistence upx

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
1944	rundll32.exe
1944	rundll32.exe
2100	rundll32.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1944-1-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1944-3-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1944-4-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/1944-13-0x0000000003190000-0x00000000031A4000-memory.dmp	upx
behavioral2/memory/2100-23-0x0000000010000000-0x0000000010014000-memory.dmp	upx
behavioral2/memory/2100-24-0x0000000010000000-0x0000000010014000-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\\jkkJdBtU.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{516B16E3-E30E-4EF3-B8A8-2E70D4743383}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{516B16E3-E30E-4EF3-B8A8-2E70D4743383}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{516B16E3-E30E-4EF3-B8A8-2E70D4743383}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{516B16E3-E30E-4EF3-B8A8-2E70D4743383}\InprocServer32\ = "C:\\Windows\\SysWow64\\jkkJdBtU.dll"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1944	rundll32.exe
1944	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe
2100	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
1944	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1944	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4548 wrote to memory of 1944	4548	rundll32.exe	63
PID 4548 wrote to memory of 1944	4548	rundll32.exe	63
PID 4548 wrote to memory of 1944	4548	rundll32.exe	63
PID 1944 wrote to memory of 616	1944	rundll32.exe	5
PID 1944 wrote to memory of 2100	1944	rundll32.exe	103
PID 1944 wrote to memory of 2100	1944	rundll32.exe	103
PID 1944 wrote to memory of 2100	1944	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\473f90bb310e80a9ebf912c656f85dcd.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4548
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\473f90bb310e80a9ebf912c656f85dcd.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:1944
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\jkkJdBtU.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:2100

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\jkkJdBtU.dll

Filesize
40KB

MD5
473f90bb310e80a9ebf912c656f85dcd

SHA1
2aac00f46d182b99165aeda2a7c9a03c02c0116e

SHA256
61490446a4c73c0e85489d8bd18a566075894f9c1de1d6b4fe2ec86b0dc064d4

SHA512
6c7c167c79191825ecee23bef68c0dc2077e9d6271b1ef22d27b9c0d013faba50451bb258ddc0598d79e68dafa972be932d57b96732285552329ed732ed28688

Download Submit
memory/1944-0-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1944-2-0x00000000015F0000-0x00000000015F8000-memory.dmp

Filesize
32KB

Download
memory/1944-1-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1944-3-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1944-4-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1944-13-0x0000000003190000-0x00000000031A4000-memory.dmp

Filesize
80KB

Download
memory/1944-18-0x00000000031B0000-0x00000000031B8000-memory.dmp

Filesize
32KB

Download
memory/2100-23-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/2100-24-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download