6c8db88f41c43a13c2dbf6ee8317b0fc6702590c3aac12bdadf7142c524958ac

Resubmissions

14/10/2024, 08:05

241014-jyw9dssclc 10

29/04/2024, 17:22

240429-vx1qzage2x 10

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
14/10/2024, 08:05

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General

Target

Winlocker.exe
Size

18KB
MD5

f17aa8c813d60fc139510070c83228b1
SHA1

0ecf72d2d6d3be23300aa16ceea78d551ca98ebf
SHA256

6c8db88f41c43a13c2dbf6ee8317b0fc6702590c3aac12bdadf7142c524958ac
SHA512

764693c9beace369424297ee65a15535b6bf26465d849d34bf010061e44b8ef9e0fe82fe88dc52bb2b48a6e197f4da5d51c46a768fee992606d794324677adb9
SSDEEP

384:NlFftUnn8BYQ3Lq+IyOLVSf9xKo6kYcV6O7UiJFnh:TFfSPTyOLb8YcV6O4izh

Score

10^/10

discovery evasion persistence trojan

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,, C:\\Users\\Admin\\AppData\\Local\\Temp\\Winlocker.exe"	Winlocker.exe

UAC bypass 3 TTPs 1 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Winlocker.exe

Disables Task Manager via registry modification
evasion

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Winlocker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Winlocker.exe

System Location Discovery: System Language Discovery 1 TTPs 4 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	Winlocker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe

Kills process with taskkill 2 IoCs

evasion

pid	Process
2888	taskkill.exe
2632	taskkill.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2888	taskkill.exe
Token: SeDebugPrivilege	2632	taskkill.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2096	Winlocker.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2096 wrote to memory of 2800	2096	Winlocker.exe	30
PID 2096 wrote to memory of 2800	2096	Winlocker.exe	30
PID 2096 wrote to memory of 2800	2096	Winlocker.exe	30
PID 2096 wrote to memory of 2800	2096	Winlocker.exe	30
PID 2800 wrote to memory of 2888	2800	cmd.exe	32
PID 2800 wrote to memory of 2888	2800	cmd.exe	32
PID 2800 wrote to memory of 2888	2800	cmd.exe	32
PID 2800 wrote to memory of 2888	2800	cmd.exe	32
PID 2800 wrote to memory of 2632	2800	cmd.exe	34
PID 2800 wrote to memory of 2632	2800	cmd.exe	34
PID 2800 wrote to memory of 2632	2800	cmd.exe	34
PID 2800 wrote to memory of 2632	2800	cmd.exe	34

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Winlocker.exe

C:\Users\Admin\AppData\Local\Temp\Winlocker.exe
"C:\Users\Admin\AppData\Local\Temp\Winlocker.exe"
1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Checks whether UAC is enabled
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2096
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /c taskkill /f /im explorer.exe & taskkill /f /im taskmgr.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2800
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /f /im explorer.exe
    3⤵
    - System Location Discovery: System Language Discovery
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:2888
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /f /im taskmgr.exe
    3⤵
    - System Location Discovery: System Language Discovery
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:2632

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2096-0-0x000000007432E000-0x000000007432F000-memory.dmp

Filesize
4KB

Download
memory/2096-1-0x0000000000A60000-0x0000000000A6A000-memory.dmp

Filesize
40KB

Download
memory/2096-2-0x0000000074320000-0x0000000074A0E000-memory.dmp

Filesize
6.9MB

Download
memory/2096-3-0x000000007432E000-0x000000007432F000-memory.dmp

Filesize
4KB

Download
memory/2096-4-0x0000000074320000-0x0000000074A0E000-memory.dmp

Filesize
6.9MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads