2a775e249c7cb9d2c448f28b7f48ae8d09c1e13b420ae390dd9ac8574456818c

Analysis

user interaction
yes
max time kernel
148s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260630-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260630-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
01/07/2026, 06:03

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General

Target
boykisser.exe
Size 4.2MB
Sample260701-gr8mqsft9p
SHA256 2a775e249c7cb9d2c448f28b7f48ae8d09c1e13b420ae390dd9ac8574456818c
MD5 f3f5785cf12910856e7fb01a2dced909
SHA1 6401bcebd78076696d47bab17fcd2b52e40b1d57
SHA512 75ca7d1982ffeb156259f44a1ad6b0fb244ab9e0413289f40f607040ec70d78112d1a43c3e3f86ac9cbf5d6715f462cb2fefd5acbbca44e57364b23a44b3de23
SSDEEP 98304:iAv3p9weGoB2J5WnD1SoYws71H7htbOcGHpFUsIu15jwemdMB4RLa6TPU:J38elBkSs71FtbOc88sIu1dwemd5D
TLSH
T1C11633F2B9E6E104EFC8F7BFC94292688A190A3D95D4DEB2918CA55C3057E6D303B854
MD5 SHA1 SHA512 SSDEEP TLSH

Score

8^/10

defense_evasion ransomware

Malware Config

Signatures

Disables Task Manager via registry modification
defense_evasion
Obfuscated Files or Information: Command Obfuscation 1 TTPs
Adversaries may obfuscate content during command execution to impede detection.
defense_evasion

Command Obfuscation
T1027.010

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2132828192-1552876075-2324613956-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\boykisser_wallpaper.png"	boykisser.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{B4BFCC3A-DB2C-424C-B029-7FE99A87C641}\Instance\	NOTEPAD.EXE

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
1872	reg.exe
6048	reg.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
4512	NOTEPAD.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1044	powershell.exe
1044	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1044	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3956 wrote to memory of 1044	3956	boykisser.exe	88
PID 1044 wrote to memory of 4312	1044	powershell.exe	90
PID 4312 wrote to memory of 1872	4312	boykisser.exe	92
PID 4312 wrote to memory of 6048	4312	boykisser.exe	94

C:\Users\Admin\AppData\Local\Temp\boykisser.exe
"C:\Users\Admin\AppData\Local\Temp\boykisser.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3956
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -EncodedCommand UwB0AGEAcgB0AC0AUAByAG8AYwBlAHMAcwAgAC0AVgBlAHIAYgAgAFIAdQBuAEEAcwAgAC0ARgBpAGwAZQBQAGEAdABoACAAJwBDADoAXABVAHMAZQByAHMAXABBAGQAbQBpAG4AXABBAHAAcABEAGEAdABhAFwATABvAGMAYQBsAFwAVABlAG0AcABcAGIAbwB5AGsAaQBzAHMAZQByAC4AZQB4AGUAJwAgAC0AQQByAGcAdQBtAGUAbgB0AEwAaQBzAHQAIAAnAC0ALQBlAGwAZQB2AGEAdABlAGQAJwAgAC0AVwBpAG4AZABvAHcAUwB0AHkAbABlACAASABpAGQAZABlAG4A
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1044
- - C:\Users\Admin\AppData\Local\Temp\boykisser.exe
    "C:\Users\Admin\AppData\Local\Temp\boykisser.exe" --elevated
    3⤵
    - Sets desktop wallpaper using registry
    - Suspicious use of WriteProcessMemory
    PID:4312
  - - C:\Windows\system32\reg.exe
      "reg" add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      Modifies registry key
      PID:1872
  - - C:\Windows\system32\reg.exe
      "reg" add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      Modifies registry key
      PID:6048

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\logs.txt
1⤵
- Modifies registry class
- Opens file in notepad (likely ransom note)
PID:4512

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Obfuscated Files or Information

T1027

Command Obfuscation

T1027.010

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

Replay Monitor

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Downloads

logs.txt

Path C:\Users\Admin\Desktop\logs.txt
Size 253B
SHA256 a5bc2133e50fb86329f29c1ba9748e3f3ff18ff15e89e73f018736e73082d740
MD5 2e854f02d52c21a806f291d15e3d76d4
SHA1 eaf10f7ebe07011f4482e8104d052b2c0e448585
SHA512 d64de11a31b699ce054f2bc1a1c183ae8c8b9a9d0857e56d62fa8095be05ee5e5656306d99c9d8c1ffaf0a877b28d938d119f249b0ff035271b0f8c8e3ab52f7
TLSH
T199D05E9443C1001CCB071897C1403373046EBB0B960005F2D2A8621D7063A1A2BA37F0
MD5 SHA1 SHA512 TLSH

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logs.txt

Path C:\Users\Admin\Desktop\logs.txt
Size 428B
SHA256 cfb3cc994207790c402487b0c968d84253d284596f13f79d2e2834e100162fa2
MD5 73dca6ae1adb850130fbe1ad4a346763
SHA1 6a58efdba0de9a6b76e723a0631eefe21c873f21
SHA512 c463c5b15b27ed7248d5a68215ec7b1d6b5997af41eb4e5f60dcf766e417ed3c00ba3c135507495336003536b78971a1701c17ed6392abe568ec8f77989bfaf9
TLSH
T164E0929043D1004DCB671BAAD1103BB310AE7B47551049B2D3EDA24DB1A75A72BE73F0
MD5 SHA1 SHA512 TLSH

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memory/1044-15-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-16-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-9-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-10-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-13-0x00000273D2AB0000-0x00000273D2AD2000-memory.dmp

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memory/1044-14-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-7-0x00007FFC4552F000-0x00007FFC45530000-memory.dmp

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memory/1044-8-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-18-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/1044-19-0x00007FFC453A0000-0x00007FFC45D44000-memory.dmp

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memory/3956-0-0x00007FF7FBFC0000-0x00007FF7FC5A6000-memory.dmp

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memory/3956-6-0x00007FF7FBFC0000-0x00007FF7FC5A6000-memory.dmp

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memory/4312-20-0x00007FF7FBFC0000-0x00007FF7FC5A6000-memory.dmp

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memory/4312-38-0x00007FF7FBFC0000-0x00007FF7FC5A6000-memory.dmp

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