dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef

Analysis

max time kernel
150s
max time network
123s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
07-05-2024 02:07

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General

Target

dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe
Size

211KB
MD5

4d6f250bb8d011ade5678301ef60d3d4
SHA1

07c2ef14f490767bf938bd9bce997f3384da3be4
SHA256

dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef
SHA512

52fce216b88e3089e57633f83c409abecf596d6ea126129be7136630503ee8e86250389a53bbc00e524c191ca0339faba895020e48f47b3b95c5b605d5ff183a
SSDEEP

3072:WD6Xtx68yygRBE52mxkEOHLRMpZ4deth8PEAjAfIbAYGPhz6sPJBInxZqO4:Wh8cBzHLRMpZ4d1Z4

Score

10^/10

evasion persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	userinit.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	userinit.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	swchost.exe

Modifies Installed Components in the registry 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	userinit.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe

Executes dropped EXE 4 IoCs

pid	Process
2580	userinit.exe
2364	spoolsw.exe
2536	swchost.exe
2408	spoolsw.exe

Adds Run key to start application 2 TTPs 4 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\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	swchost.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\system\udsys.exe	userinit.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\userinit.exe	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe
File opened for modification	\??\c:\windows\spoolsw.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	spoolsw.exe
File opened for modification	\??\c:\windows\userinit.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	swchost.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe
2580	userinit.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe
2580	userinit.exe
2580	userinit.exe
2536	swchost.exe
2536	swchost.exe
2580	userinit.exe
2536	swchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2580	userinit.exe
2536	swchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe
640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe
2580	userinit.exe
2580	userinit.exe
2364	spoolsw.exe
2364	spoolsw.exe
2536	swchost.exe
2536	swchost.exe
2408	spoolsw.exe
2408	spoolsw.exe
2580	userinit.exe
2580	userinit.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 640 wrote to memory of 2580	640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe	29
PID 640 wrote to memory of 2580	640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe	29
PID 640 wrote to memory of 2580	640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe	29
PID 640 wrote to memory of 2580	640	dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe	29
PID 2580 wrote to memory of 2364	2580	userinit.exe	30
PID 2580 wrote to memory of 2364	2580	userinit.exe	30
PID 2580 wrote to memory of 2364	2580	userinit.exe	30
PID 2580 wrote to memory of 2364	2580	userinit.exe	30
PID 2364 wrote to memory of 2536	2364	spoolsw.exe	31
PID 2364 wrote to memory of 2536	2364	spoolsw.exe	31
PID 2364 wrote to memory of 2536	2364	spoolsw.exe	31
PID 2364 wrote to memory of 2536	2364	spoolsw.exe	31
PID 2536 wrote to memory of 2408	2536	swchost.exe	32
PID 2536 wrote to memory of 2408	2536	swchost.exe	32
PID 2536 wrote to memory of 2408	2536	swchost.exe	32
PID 2536 wrote to memory of 2408	2536	swchost.exe	32

C:\Users\Admin\AppData\Local\Temp\dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe
"C:\Users\Admin\AppData\Local\Temp\dffce7fe5a998086d3e8e70c395ca9bbaa966b7ac74383e9de38c39732ab6cef.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:640
- \??\c:\windows\userinit.exe
  c:\windows\userinit.exe
  2⤵
  - Modifies WinLogon for persistence
  - Modifies visiblity of hidden/system files in Explorer
  - Modifies Installed Components in the registry
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2580
- - \??\c:\windows\spoolsw.exe
    c:\windows\spoolsw.exe SE
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2364
  - - \??\c:\windows\swchost.exe
      c:\windows\swchost.exe
      4⤵
      Modifies WinLogon for persistence
      Modifies visiblity of hidden/system files in Explorer
      Modifies Installed Components in the registry
      Executes dropped EXE
      Adds Run key to start application
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2536
    - - \??\c:\windows\spoolsw.exe
        
        c:\windows\spoolsw.exe PR
        5⤵
        Executes dropped EXE
        Suspicious use of SetWindowsHookEx
        
        PID:2408

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

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\mrsys.exe

Filesize
211KB

MD5
540c2a73235cdb478928b2cb4df26d22

SHA1
bedb91c46d6f5f8da7a05cf30dd84373ce12c653

SHA256
d134fc8c3ba1514d3126cdc190ccf83c5bbec37a104d491f673dedfb9104476a

SHA512
bf9b0342e360c79aac2bab2c6e6e685923e77fb023b513a4112320b2647a3fb550d2e1657124a5611828b085c9456e8fedfd5f53c411c9358081cf86674af206

Download Submit
C:\Windows\spoolsw.exe

Filesize
211KB

MD5
a2c09faafea1b57cfb4d29cc43deb01b

SHA1
da5d0d6db4cad8724bfa8346c0cd1b9f5f16918c

SHA256
7a6615c5b1655fa44b68330adce4ac97437821bfb20bfbf8e1c9507b08569cd9

SHA512
5c1a30d58cab81fbc2f2a5081d22a4549acec01d5f3e3defaffb421620b01ea7fa2e3c8ceccc592a3672f40e25e88a3628c8c020f20c281af2ed385c33fc2af5

Download Submit
C:\Windows\swchost.exe

Filesize
211KB

MD5
1601e319eefbc75f80c905fa2cf20fb5

SHA1
8681f88fa9221d2933ea306c0cfa602328fcbb53

SHA256
83cfc920a470741a662698a9bad569265e064ffd97fe0910f72d6b66c61a850b

SHA512
838f9563fe0fe4b64e0a1fcee2333620f50f0365ea8ef51c7de6598535e6ddec82357d8c58fefc85c6ef1fb6e4590fe1e46e4e7e80d6b10b68cb0b553ba543ea

Download Submit
C:\Windows\userinit.exe

Filesize
211KB

MD5
6148f2238e1b75c128d875a11614ebee

SHA1
6826dded2a36f49076dbb1bf08737a081e4c42ae

SHA256
8d4dffa42271fe5c069f935482274bd63606d481239e3f97f1ca306224c46579

SHA512
15b9a7be8846406f2af6cfe5f09e89903cfb898dff35ab98f6c3157f4991a6e58e04c5d4eee8ab88c826ef4d79734052787242edd9b8fd0585fcfbbe2c070147

Download Submit
memory/640-0-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/640-11-0x0000000000760000-0x0000000000790000-memory.dmp

Filesize
192KB

Download
memory/640-50-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/2364-23-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/2364-35-0x0000000001F80000-0x0000000001FB0000-memory.dmp

Filesize
192KB

Download
memory/2364-48-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/2408-47-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/2536-41-0x0000000002520000-0x0000000002550000-memory.dmp

Filesize
192KB

Download