83f154b0468c9969b8e5ebd7e6c7aefb0b9a8fe839c893041610bddbaa45f5e2

Analysis

max time kernel
159s
max time network
161s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
30-12-2023 02:46

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General

Target

0c1bb677a665c551d21b410740822cfe.exe
Size

43KB
MD5

0c1bb677a665c551d21b410740822cfe
SHA1

2a1f4367fa1e7f6aa78912c1912c1711d73d45d5
SHA256

83f154b0468c9969b8e5ebd7e6c7aefb0b9a8fe839c893041610bddbaa45f5e2
SHA512

28020f49ed01f99dfc6209c98963ba365ed0d1b5d118496e9aeed87d276b3a1ef324a430b536d02b6a84dfecbdf3de46436f4b05ed1c97bfd9c7f5d86beae037
SSDEEP

768:P1iYZvq0orTwvgXcD6bmDzBBBywZu2z7JZ7TCyx:Nn4rogXwDlnywZu2XVx

Score

7^/10

persistence

Malware Config

Signatures

Loads dropped DLL 2 IoCs

pid	Process
4932	0c1bb677a665c551d21b410740822cfe.exe
4616	rundll32.exe

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\\efcDSKbC.dll,#1"	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\efcDSKbC.dll	0c1bb677a665c551d21b410740822cfe.exe
File opened for modification	C:\Windows\SysWOW64\efcDSKbC.dll	0c1bb677a665c551d21b410740822cfe.exe
File opened for modification	C:\Windows\SysWOW64\awtusrQi.dll	0c1bb677a665c551d21b410740822cfe.exe
File created	C:\Windows\SysWOW64\awtusrQi.dll	0c1bb677a665c551d21b410740822cfe.exe

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8EA479BF-A910-4B14-8BB1-CD195871F947}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8EA479BF-A910-4B14-8BB1-CD195871F947}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8EA479BF-A910-4B14-8BB1-CD195871F947}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8EA479BF-A910-4B14-8BB1-CD195871F947}\InprocServer32\ = "C:\\Windows\\SysWow64\\efcDSKbC.dll"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4932	0c1bb677a665c551d21b410740822cfe.exe
4932	0c1bb677a665c551d21b410740822cfe.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe
4616	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4932	0c1bb677a665c551d21b410740822cfe.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4932	0c1bb677a665c551d21b410740822cfe.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 628	4932	0c1bb677a665c551d21b410740822cfe.exe	6
PID 4932 wrote to memory of 4616	4932	0c1bb677a665c551d21b410740822cfe.exe	103
PID 4932 wrote to memory of 4616	4932	0c1bb677a665c551d21b410740822cfe.exe	103
PID 4932 wrote to memory of 4616	4932	0c1bb677a665c551d21b410740822cfe.exe	103
PID 4932 wrote to memory of 4200	4932	0c1bb677a665c551d21b410740822cfe.exe	104
PID 4932 wrote to memory of 4200	4932	0c1bb677a665c551d21b410740822cfe.exe	104
PID 4932 wrote to memory of 4200	4932	0c1bb677a665c551d21b410740822cfe.exe	104

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:628

C:\Users\Admin\AppData\Local\Temp\0c1bb677a665c551d21b410740822cfe.exe
"C:\Users\Admin\AppData\Local\Temp\0c1bb677a665c551d21b410740822cfe.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4932
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Windows\system32\efcDSKbC.dll,a
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  PID:4616
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\removalfile.bat "C:\Users\Admin\AppData\Local\Temp\0c1bb677a665c551d21b410740822cfe.exe"
  2⤵
  PID:4200

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:\Users\Admin\AppData\Local\Temp\removalfile.bat

Filesize
43B

MD5
9a7ef09167a6f4433681b94351509043

SHA1
259b1375ed8e84943ca1d42646bb416325c89e12

SHA256
d5739a0510d89da572eb0b0d394d4fb4dd361cd9ee0144b9b31c590df93c3be7

SHA512
96b84cd88a0e4b7c1122af3ed6ce5edf0a9a4e9bf79575eadfac16b2c46f1278d57755d29f21d7c6dcb4403be24b7ac7da4837c6cc9c602342a8f2b8e54883df

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

Filesize
32KB

MD5
5ef1e1bc70283a55d8aa48a70cde22a9

SHA1
b8aabec95c3c26c1628e86c3b0ae93b3c3222dbc

SHA256
154a5b656ec9c73b2bdababc266bca7a4a3b0b923718e7aa556041aad4812874

SHA512
8a63e5d0b2c9700a5c47e1e60a84a9669fbf298505e158304c93fbc960adc23882a2789a776bae267c61295b905978b09d22895bfe100af5987278346b3646cf

Download Submit
memory/4616-32-0x0000000000850000-0x0000000000855000-memory.dmp

Filesize
20KB

Download
memory/4616-30-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4616-29-0x0000000000850000-0x0000000000855000-memory.dmp

Filesize
20KB

Download
memory/4932-8-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

Filesize
20KB

Download
memory/4932-14-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4932-17-0x00000000005D0000-0x00000000005D5000-memory.dmp

Filesize
20KB

Download
memory/4932-18-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

Filesize
20KB

Download
memory/4932-13-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/4932-1-0x00000000005D0000-0x00000000005D5000-memory.dmp

Filesize
20KB

Download
memory/4932-7-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4932-0-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download