60c73b767a7c748be246b9c8edf19922e361f961fde414cdaa20f05933ef983e

Analysis

max time kernel
150s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
28/03/2025, 11:13

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General

Target

Client1.exe
Size

75KB
MD5

aaa9a1048accb362dff125208ceee259
SHA1

c155cd8763879f4bd22345275d3f4e804683293d
SHA256

60c73b767a7c748be246b9c8edf19922e361f961fde414cdaa20f05933ef983e
SHA512

294ed8482f7f8f670c635f25c299e567357a60f64c7daebcafc2b19c157cffc43d6f448747c5fae8c0865c55916d2f85d4ab3ec7d82a79bd2b99425f754260a1
SSDEEP

1536:e0nZz1Ir/ZLtez0RtrnXw6cIASbtLEmfcHQ5pqKmY7:e0AeQnXrASbtQqDiz

Score

10^/10

defense_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:\\Windows\\System32\\Wincall.exe"	Client1.exe

Windows security bypass 2 TTPs 8 IoCs

defense_evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates = "0"	Client1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\System32\Wincall.exe = "0"	Client1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\Client1.exe = "0"	Client1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\System32\Wincall.exe = "0"	Wincall.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates = "0"	Wincall.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\System32\Wincall.exe = "0"	Wincall.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates = "0"	Wincall.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	Client1.exe

Executes dropped EXE 2 IoCs

pid	Process
3700	Wincall.exe
3536	Wincall.exe

Windows security modification 2 TTPs 9 IoCs

defense_evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\System32\Wincall.exe = "0"	Client1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\Client1.exe = "0"	Client1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates = "0"	Wincall.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates = "0"	Client1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\System32\Wincall.exe = "0"	Wincall.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates = "0"	Wincall.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\System32\Wincall.exe = "0"	Wincall.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	Client1.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	Client1.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\Wincall.exe	Wincall.exe
File opened for modification	C:\Windows\System32\Wincall.exe	Wincall.exe
File created	C:\Windows\System32\Wincall.exe	Client1.exe
File opened for modification	C:\Windows\System32\Wincall.exe	Client1.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32	Client1.exe
File opened for modification	C:\Windows\System32	Wincall.exe
File opened for modification	C:\Windows\System32	Wincall.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3432	schtasks.exe
1180	schtasks.exe
1852	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe
5116	Client1.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	5116	Client1.exe
Token: SeDebugPrivilege	5116	Client1.exe
Token: SeDebugPrivilege	3700	Wincall.exe
Token: SeDebugPrivilege	3700	Wincall.exe
Token: SeDebugPrivilege	3536	Wincall.exe
Token: SeDebugPrivilege	3536	Wincall.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5116	Client1.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5116 wrote to memory of 1136	5116	Client1.exe	99
PID 5116 wrote to memory of 1136	5116	Client1.exe	99
PID 1136 wrote to memory of 1852	1136	cmd.exe	101
PID 1136 wrote to memory of 1852	1136	cmd.exe	101
PID 5116 wrote to memory of 3068	5116	Client1.exe	103
PID 5116 wrote to memory of 3068	5116	Client1.exe	103
PID 3068 wrote to memory of 3432	3068	cmd.exe	105
PID 3068 wrote to memory of 3432	3068	cmd.exe	105
PID 5116 wrote to memory of 5648	5116	Client1.exe	106
PID 5116 wrote to memory of 5648	5116	Client1.exe	106
PID 5648 wrote to memory of 1180	5648	cmd.exe	108
PID 5648 wrote to memory of 1180	5648	cmd.exe	108

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client1.exe
"C:\Users\Admin\AppData\Local\Temp\Client1.exe"
1⤵
- Modifies WinLogon for persistence
- Windows security bypass
- Windows security modification
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5116
- C:\Windows\SYSTEM32\cmd.exe
  "cmd" /c schtasks /create /f /sc onlogon /rl highest /tn "MicrosoftEdgeUpdateMachineCore" /tr '"C:\Windows\System32\Wincall.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1136
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "MicrosoftEdgeUpdateMachineCore" /tr '"C:\Windows\System32\Wincall.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1852
- C:\Windows\SYSTEM32\cmd.exe
  "cmd" /c schtasks /create /f /sc minute /mo 1 /tn "Discord update" /tr "C:\Windows\System32\Wincall.exe" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3068
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc minute /mo 1 /tn "Discord update" /tr "C:\Windows\System32\Wincall.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3432
- C:\Windows\SYSTEM32\cmd.exe
  "cmd" /c schtasks /create /f /sc minute /mo 3 /tn "Google common update" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Intel\Games\Common\Commonuodate.exe" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5648
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc minute /mo 3 /tn "Google common update" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Intel\Games\Common\Commonuodate.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1180

C:\Windows\System32\Wincall.exe
C:\Windows\System32\Wincall.exe
1⤵
- Windows security bypass
- Executes dropped EXE
- Windows security modification
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:3700

C:\Windows\System32\Wincall.exe
C:\Windows\System32\Wincall.exe
1⤵
- Windows security bypass
- Executes dropped EXE
- Windows security modification
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:3536

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Wincall.exe.log

Filesize
226B

MD5
28d7fcc2b910da5e67ebb99451a5f598

SHA1
a5bf77a53eda1208f4f37d09d82da0b9915a6747

SHA256
2391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c

SHA512
2d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\Intel\Games\Common\Commonuodate.exe

Filesize
75KB

MD5
aaa9a1048accb362dff125208ceee259

SHA1
c155cd8763879f4bd22345275d3f4e804683293d

SHA256
60c73b767a7c748be246b9c8edf19922e361f961fde414cdaa20f05933ef983e

SHA512
294ed8482f7f8f670c635f25c299e567357a60f64c7daebcafc2b19c157cffc43d6f448747c5fae8c0865c55916d2f85d4ab3ec7d82a79bd2b99425f754260a1

Download Submit
memory/5116-0-0x00007FFFA6C43000-0x00007FFFA6C45000-memory.dmp

Filesize
8KB

Download
memory/5116-1-0x00000206B5140000-0x00000206B5158000-memory.dmp

Filesize
96KB

Download
memory/5116-5-0x00007FFFA6C40000-0x00007FFFA7701000-memory.dmp

Filesize
10.8MB

Download
memory/5116-33-0x00007FFFA6C43000-0x00007FFFA6C45000-memory.dmp

Filesize
8KB

Download
memory/5116-34-0x00007FFFA6C40000-0x00007FFFA7701000-memory.dmp

Filesize
10.8MB

Download
memory/5116-92-0x00007FFFA6C40000-0x00007FFFA7701000-memory.dmp

Filesize
10.8MB

Download
memory/5116-288-0x00007FFFA6C40000-0x00007FFFA7701000-memory.dmp

Filesize
10.8MB

Download