f1bbcc5c678d174d858ae089f4494e3ea8bcfc418098d61804a15e437f08aff7

Target

[email protected]
Size

136KB
MD5

70108103a53123201ceb2e921fcfe83c
SHA1

c71799a6a6d09ee758b04cdf90a4ab76fbd2a7e3
SHA256

9c3f8df80193c085912c9950c58051ae77c321975784cc069ceacd4f57d5861d
SHA512

996701c65eee7f781c2d22dce63f4a95900f36b97a99dcf833045bce239a08b3c2f6326b3a808431cdab92d59161dd80763e44126578e160d79b7095175d276b

Score

8^/10

bootkit persistence ransomware

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

sys3.exe

pid	Process
2896	sys3.exe

Modifies WinLogon to allow AutoLogon 2 TTPs 1 IoCs

Enables rebooting of the machine without requiring login credentials.

ransomware bootkit

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

LogonUI.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked	LogonUI.exe

Deletes itself 1 IoCs

Processes:

sys3.exe

pid	Process
2896	sys3.exe

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1067

Processes:

[email protected]sys3.exe

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	[email protected]
File opened for modification	\??\PHYSICALDRIVE0	sys3.exe

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	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\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	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\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

sys3.exe

description	pid	Process
Token: SeShutdownPrivilege	2896	sys3.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

LogonUI.exe

pid	Process
4056	LogonUI.exe
4056	LogonUI.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

[email protected]

description	pid	Process	procid_target
PID 1316 wrote to memory of 2896	1316	[email protected]	71
PID 1316 wrote to memory of 2896	1316	[email protected]	71
PID 1316 wrote to memory of 2896	1316	[email protected]	71

C:\Users\Admin\AppData\Local\Temp\[email protected]
"C:\Users\Admin\AppData\Local\Temp\[email protected]"
1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious use of WriteProcessMemory
PID:1316
- C:\Users\Admin\AppData\Local\Temp\sys3.exe
  C:\Users\Admin\AppData\Local\Temp\\sys3.exe
  2⤵
  - Executes dropped EXE
  - Deletes itself
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of AdjustPrivilegeToken
  PID:2896

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ac8855 /state1:0x41c64e6d
1⤵
- Modifies WinLogon to allow AutoLogon
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Bootkit

T1067

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\sys3.exe

MD5
70108103a53123201ceb2e921fcfe83c

SHA1
c71799a6a6d09ee758b04cdf90a4ab76fbd2a7e3

SHA256
9c3f8df80193c085912c9950c58051ae77c321975784cc069ceacd4f57d5861d

SHA512
996701c65eee7f781c2d22dce63f4a95900f36b97a99dcf833045bce239a08b3c2f6326b3a808431cdab92d59161dd80763e44126578e160d79b7095175d276b

Download Submit
C:\Users\Admin\AppData\Local\Temp\sys3.exe

MD5
70108103a53123201ceb2e921fcfe83c

SHA1
c71799a6a6d09ee758b04cdf90a4ab76fbd2a7e3

SHA256
9c3f8df80193c085912c9950c58051ae77c321975784cc069ceacd4f57d5861d

SHA512
996701c65eee7f781c2d22dce63f4a95900f36b97a99dcf833045bce239a08b3c2f6326b3a808431cdab92d59161dd80763e44126578e160d79b7095175d276b

Download Submit
C:\Users\Admin\AppData\Local\Temp\systm.txt

MD5
ab7368e081dc109f4133ffd943c98b74

SHA1
1847691b3535b25f368389327543392eafd3e4fa

SHA256
6c2c3417ded140721c60368f64f02b4d4ed5f39b528450b75d2475da4b80c1ae

SHA512
e59e763b66ab716a72d3121d8a8b9b6a2dd4beb89e949202ae55ef0a1cef316d56071df8a41a587c605d1575c18f2f4f3a41d2cb174a89558722e9730a913912

Download Submit
memory/2896-0-0x0000000000000000-mapping.dmp

Download

Resubmissions

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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