827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4

Analysis

max time kernel
235s
max time network
327s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
01/12/2022, 02:14

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General

Target

827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4.dll
Size

34KB
MD5

be72e91b04fc37f7c1eb3fb429090ace
SHA1

0ffba2dd7bdfa6cc14cf1c4ab93dd8d9120fd02c
SHA256

827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4
SHA512

887f8f959ad391e282de40ec6dd5a88827b2857729bf2486a6edf3b31cea748e06f04726280cbcb6a6f6cd35933e3d24d577c96f9f57ae776fee49c4d108ac08
SSDEEP

768:A34nRoRqjFwX/Hf8wHj41lpVfn0UaEauU+75S0LIlZ2jS:84aRqhwX3ND41TWUmh+75SoIPwS

Score

7^/10

persistence

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
3648	rundll32.exe
3648	rundll32.exe
4832	rundll32.exe

Adds Run key to start application 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\Run\	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\MSServer = "rundll32.exe C:\\Windows\\system32\\iiffcAsS.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32\ = "C:\\Windows\\SysWow64\\iiffcAsS.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32\ThreadingModel = "Both"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3648	rundll32.exe
3648	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe
4832	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3648	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3648	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3648	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3112 wrote to memory of 3648	3112	rundll32.exe	81
PID 3112 wrote to memory of 3648	3112	rundll32.exe	81
PID 3112 wrote to memory of 3648	3112	rundll32.exe	81
PID 3648 wrote to memory of 596	3648	rundll32.exe	3
PID 3648 wrote to memory of 4832	3648	rundll32.exe	82
PID 3648 wrote to memory of 4832	3648	rundll32.exe	82
PID 3648 wrote to memory of 4832	3648	rundll32.exe	82

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:596

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3112
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4.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:3648
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\iiffcAsS.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:4832

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\iiffcAsS.dll

Filesize
34KB

MD5
be72e91b04fc37f7c1eb3fb429090ace

SHA1
0ffba2dd7bdfa6cc14cf1c4ab93dd8d9120fd02c

SHA256
827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4

SHA512
887f8f959ad391e282de40ec6dd5a88827b2857729bf2486a6edf3b31cea748e06f04726280cbcb6a6f6cd35933e3d24d577c96f9f57ae776fee49c4d108ac08

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

Filesize
34KB

MD5
be72e91b04fc37f7c1eb3fb429090ace

SHA1
0ffba2dd7bdfa6cc14cf1c4ab93dd8d9120fd02c

SHA256
827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4

SHA512
887f8f959ad391e282de40ec6dd5a88827b2857729bf2486a6edf3b31cea748e06f04726280cbcb6a6f6cd35933e3d24d577c96f9f57ae776fee49c4d108ac08

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

Filesize
34KB

MD5
be72e91b04fc37f7c1eb3fb429090ace

SHA1
0ffba2dd7bdfa6cc14cf1c4ab93dd8d9120fd02c

SHA256
827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4

SHA512
887f8f959ad391e282de40ec6dd5a88827b2857729bf2486a6edf3b31cea748e06f04726280cbcb6a6f6cd35933e3d24d577c96f9f57ae776fee49c4d108ac08

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

Filesize
34KB

MD5
be72e91b04fc37f7c1eb3fb429090ace

SHA1
0ffba2dd7bdfa6cc14cf1c4ab93dd8d9120fd02c

SHA256
827b6ee26f2ed5cea99254e47b55278244daf3b26007c45a13540e5ffde02ae4

SHA512
887f8f959ad391e282de40ec6dd5a88827b2857729bf2486a6edf3b31cea748e06f04726280cbcb6a6f6cd35933e3d24d577c96f9f57ae776fee49c4d108ac08

Download Submit
memory/3648-141-0x0000000000DD0000-0x0000000000DD5000-memory.dmp

Filesize
20KB

Download
memory/3648-137-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/3648-138-0x0000000002AE0000-0x0000000002AF4000-memory.dmp

Filesize
80KB

Download
memory/3648-139-0x0000000001020000-0x0000000001025000-memory.dmp

Filesize
20KB

Download
memory/3648-140-0x0000000002A60000-0x0000000002AED000-memory.dmp

Filesize
564KB

Download
memory/3648-134-0x0000000000DD0000-0x0000000000DD5000-memory.dmp

Filesize
20KB

Download
memory/3648-142-0x0000000002A60000-0x0000000002AED000-memory.dmp

Filesize
564KB

Download
memory/3648-133-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/4832-146-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/4832-147-0x0000000000CC0000-0x0000000000CC5000-memory.dmp

Filesize
20KB

Download
memory/4832-148-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download