676fdc85814c991074766a302aca8f6ffbd3e35f6564b841cb712010ccd8d816

Reason

Machine shutdown

General

Target

Sigmaalpha.exe
Size

839KB
MD5

6f93bf5bd25cf58c2756121371d1bb3f
SHA1

d7fdff4e6c355add9a58bf54d66d420c97f8a9a9
SHA256

676fdc85814c991074766a302aca8f6ffbd3e35f6564b841cb712010ccd8d816
SHA512

2def16daf5c7bfe838d4a9438554df2d07fd8d93c0d090e0d099b95a19e9f8b2aba3b810f845a4b90640856d6db0343c0335ef5eb288dc62ed4f22f806678e8e
SSDEEP

24576:mBS04YNEMuExDiU6E5R9s8xY/2l/dGtnIbt+rn:mj4auS+UjfU2TGdIbt+r

Score

7^/10

discovery

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4272	AudioDriver.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	Sigmaalpha.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	Sigmaalpha.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\assembly\Desktop.ini	Sigmaalpha.exe
File opened for modification	C:\Windows\assembly	Sigmaalpha.exe
File created	C:\Windows\assembly\Desktop.ini	Sigmaalpha.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 8 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AudioDriver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Sigmaalpha.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3244	PING.EXE

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "186"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4290799360"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365268"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365268"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292114432"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292114432"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = 99ebff004cc2ff000091f8000078d4000067c000003e9200001a6800f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3244	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4272	AudioDriver.exe
4272	AudioDriver.exe
4272	AudioDriver.exe
4272	AudioDriver.exe
4272	AudioDriver.exe
4272	AudioDriver.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4272	AudioDriver.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4272	AudioDriver.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4272	AudioDriver.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1864	LogonUI.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2536 wrote to memory of 4272	2536	Sigmaalpha.exe	77
PID 2536 wrote to memory of 4272	2536	Sigmaalpha.exe	77
PID 2536 wrote to memory of 4272	2536	Sigmaalpha.exe	77
PID 4272 wrote to memory of 4432	4272	AudioDriver.exe	78
PID 4272 wrote to memory of 4432	4272	AudioDriver.exe	78
PID 4272 wrote to memory of 4432	4272	AudioDriver.exe	78
PID 4432 wrote to memory of 3244	4432	cmd.exe	80
PID 4432 wrote to memory of 3244	4432	cmd.exe	80
PID 4432 wrote to memory of 3244	4432	cmd.exe	80
PID 4432 wrote to memory of 1404	4432	cmd.exe	81
PID 4432 wrote to memory of 1404	4432	cmd.exe	81
PID 4432 wrote to memory of 1404	4432	cmd.exe	81
PID 4432 wrote to memory of 744	4432	cmd.exe	82
PID 4432 wrote to memory of 744	4432	cmd.exe	82
PID 4432 wrote to memory of 744	4432	cmd.exe	82
PID 4432 wrote to memory of 3240	4432	cmd.exe	83
PID 4432 wrote to memory of 3240	4432	cmd.exe	83
PID 4432 wrote to memory of 3240	4432	cmd.exe	83
PID 4432 wrote to memory of 4628	4432	cmd.exe	84
PID 4432 wrote to memory of 4628	4432	cmd.exe	84
PID 4432 wrote to memory of 4628	4432	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\Sigmaalpha.exe
"C:\Users\Admin\AppData\Local\Temp\Sigmaalpha.exe"
1⤵
- Drops desktop.ini file(s)
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2536
- C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4272
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\{eb132387-8baa-4821-a0f6-98ebe619d455}.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4432
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3244
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" echo j "
      4⤵
      System Location Discovery: System Language Discovery
      PID:1404
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" del "C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe""
      4⤵
      System Location Discovery: System Language Discovery
      PID:744
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" echo j "
      4⤵
      System Location Discovery: System Language Discovery
      PID:3240
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" del C:\Users\Admin\AppData\Local\Temp\{eb132387-8baa-4821-a0f6-98ebe619d455}.bat"
      4⤵
      System Location Discovery: System Language Discovery
      PID:4628

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3a02055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:1864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\{eb132387-8baa-4821-a0f6-98ebe619d455}.bat

Filesize
202B

MD5
e99ab7016dd2c529114111e328e8db98

SHA1
db1940d92f76ce382398e8afc15b32157a5b1668

SHA256
426eb1223f1dcf8122828653021f1e2cbb729f03c54f299c63bcfd42e60e20da

SHA512
71aec43a0662eb4a517072be57029ba01c0aecc9aef58eb36b6ce1527905d48c5bb0fe2daa7e8c251e4d7728b954f3d7fbe7bbf37f1c7b955080715945af2619

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe

Filesize
839KB

MD5
6f93bf5bd25cf58c2756121371d1bb3f

SHA1
d7fdff4e6c355add9a58bf54d66d420c97f8a9a9

SHA256
676fdc85814c991074766a302aca8f6ffbd3e35f6564b841cb712010ccd8d816

SHA512
2def16daf5c7bfe838d4a9438554df2d07fd8d93c0d090e0d099b95a19e9f8b2aba3b810f845a4b90640856d6db0343c0335ef5eb288dc62ed4f22f806678e8e

Download Submit
memory/2536-0-0x0000000074AF1000-0x0000000074AF2000-memory.dmp

Filesize
4KB

Download
memory/2536-1-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/2536-2-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/2536-18-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-21-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-20-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-22-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-23-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-24-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-25-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-26-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-19-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download
memory/4272-32-0x0000000074AF0000-0x00000000750A1000-memory.dmp

Filesize
5.7MB

Download

Resubmissions

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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