188d071fa7ec7c48dadf1d0f9a950d1b59b5368c54c5f6cbc2d7df68360902ea

General

Target
virussign.com_953f33277b03936935a81658cb46cc0c.exe
Size 149KB
Sample240303-ls1ezagg3w
SHA256 188d071fa7ec7c48dadf1d0f9a950d1b59b5368c54c5f6cbc2d7df68360902ea
MD5 953f33277b03936935a81658cb46cc0c
SHA1 7b6154aaf6d3854ee67f759be22d7612e62ff4dc
SHA512 62d8036c2faaa1ff193f75d785ec926fbf8f99ff1e2b9ea527d1f97a9fe8a8c797af1374ad718eebb296abca95554e57672668613a06139647cdbfedef0ca6b9
SSDEEP 3072:4xIt0EJ3pSaCQSeqL87yBDP5PmFzQuJxoXoTegDtt:iIHYag8exOQuToYKgD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

evasion persistence trojan

Malware Config

Signatures

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	winjsnd.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	winjsnd.exe

Windows security bypass 2 TTPs 6 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesOverride = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	winjsnd.exe

Detects Windows executables referencing non-Windows User-Agents 4 IoCs

resource	yara_rule
behavioral2/memory/2044-2-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4196-10-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/2044-11-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4196-12-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects executables embedding registry key / value combination indicative of disabling Windows Defender features 4 IoCs

resource	yara_rule
behavioral2/memory/2044-2-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_RegKeyComb_DisableWinDefender
behavioral2/memory/4196-10-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_RegKeyComb_DisableWinDefender
behavioral2/memory/2044-11-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_RegKeyComb_DisableWinDefender
behavioral2/memory/4196-12-0x0000000000400000-0x00000000004A8000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_RegKeyComb_DisableWinDefender

Executes dropped EXE 1 IoCs

pid	Process
4196	winjsnd.exe

Windows security modification 2 TTPs 7 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesOverride = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	winjsnd.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AutoUpdateDisableNotify = "1"	winjsnd.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3045580317-3728985860-206385570-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Microsoft Windows Services = "C:\\Windows\\12811091916569808\\winjsnd.exe"	virussign.com_953f33277b03936935a81658cb46cc0c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Microsoft Windows Services = "C:\\Windows\\12811091916569808\\winjsnd.exe"	virussign.com_953f33277b03936935a81658cb46cc0c.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\12811091916569808\winjsnd.exe	virussign.com_953f33277b03936935a81658cb46cc0c.exe
File opened for modification	C:\Windows\12811091916569808\winjsnd.exe	virussign.com_953f33277b03936935a81658cb46cc0c.exe
File opened for modification	C:\Windows\12811091916569808	virussign.com_953f33277b03936935a81658cb46cc0c.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4188	2044	WerFault.exe	85

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 4196	2044	virussign.com_953f33277b03936935a81658cb46cc0c.exe	91
PID 2044 wrote to memory of 4196	2044	virussign.com_953f33277b03936935a81658cb46cc0c.exe	91
PID 2044 wrote to memory of 4196	2044	virussign.com_953f33277b03936935a81658cb46cc0c.exe	91

C:\Users\Admin\AppData\Local\Temp\virussign.com_953f33277b03936935a81658cb46cc0c.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_953f33277b03936935a81658cb46cc0c.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:2044
- C:\Windows\12811091916569808\winjsnd.exe
  C:\Windows\12811091916569808\winjsnd.exe
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Windows security bypass
  - Executes dropped EXE
  - Windows security modification
  PID:4196
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2044 -s 556
  2⤵
  - Program crash
  PID:4188

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2044 -ip 2044
1⤵
PID:1268

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Defense Evasion

Impair Defenses

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

winjsnd.exe

Path C:\Windows\12811091916569808\winjsnd.exe
Size 149KB
SHA256 188d071fa7ec7c48dadf1d0f9a950d1b59b5368c54c5f6cbc2d7df68360902ea
MD5 953f33277b03936935a81658cb46cc0c
SHA1 7b6154aaf6d3854ee67f759be22d7612e62ff4dc
SHA512 62d8036c2faaa1ff193f75d785ec926fbf8f99ff1e2b9ea527d1f97a9fe8a8c797af1374ad718eebb296abca95554e57672668613a06139647cdbfedef0ca6b9
SSDEEP 3072:4xIt0EJ3pSaCQSeqL87yBDP5PmFzQuJxoXoTegDtt:iIHYag8exOQuToYKgD
MD5 SHA1 SHA512 SSDEEP

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memory/2044-1-0x0000000000800000-0x0000000000900000-memory.dmp

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memory/2044-2-0x0000000000400000-0x00000000004A8000-memory.dmp

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memory/2044-11-0x0000000000400000-0x00000000004A8000-memory.dmp

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memory/4196-9-0x0000000000600000-0x0000000000700000-memory.dmp

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memory/4196-10-0x0000000000400000-0x00000000004A8000-memory.dmp

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memory/4196-12-0x0000000000400000-0x00000000004A8000-memory.dmp

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memory/4196-13-0x0000000000600000-0x0000000000700000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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