killmbr | 5536a0db0635e1e08bec0edc99d1d2e3359cb797c850d69844a16ab4cc433b2c

Analysis

max time kernel
150s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
17/07/2026, 10:33

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General

Target
Icb Temp Woofer.exe
Size 149KB
Sample260717-mljpbacy2t
SHA256 5536a0db0635e1e08bec0edc99d1d2e3359cb797c850d69844a16ab4cc433b2c
MD5 e372814977186ce7888ea942bafda582
SHA1 507d075a85b23f6ea5780ca5a8e4dbf3798f0c2d
SHA512 a726d2491c2757ac337a7902cdf9b4bff2fbcb56bf79d684aceefe8425a1062fb27612fa808e1014bc53c7668e08f30ab919ed1a2dfa33a4d8f1d9c7ad500a3b
SSDEEP 3072:UVqoCl/YgjxEufVU0TbTyDDalRDFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWp:UsLqdufVUNDavFWFWFWFWFWFWFWFWFWE
TLSH
T165E32813AE50542FE855C9F028A5F66ABB155F361F90EE03B6D6BB0436B254372F230B
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery killmbr persistence trojan wiper

Malware Config

Signatures

Family: KillMBR
KillMBR is a trojan that attempts to overwrite the Master Boot Record.
wiper trojan killmbr

Detects KillMBR 1 IoCs

resource	yara_rule
behavioral2/files/0x000d00000001c5af-8.dat	family_killmbr

Modifies visibility of hidden/system files in Explorer 2 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

Executes dropped EXE 6 IoCs

pid	Process
5408	icb temp woofer.exe
3712	icsys.icn.exe
1296	explorer.exe
2944	spoolsv.exe
4432	svchost.exe
3824	spoolsv.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	explorer.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\explorer.exe	explorer.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	svchost.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\resources\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\resources\svchost.exe	spoolsv.exe
File opened for modification	C:\Windows\Resources\tjud.exe	explorer.exe
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	Icb Temp Woofer.exe
File opened for modification	\??\c:\windows\resources\themes\explorer.exe	icsys.icn.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 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	Icb Temp Woofer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icb temp woofer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icsys.icn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe

Modifies registry class 7 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	icb temp woofer.exe
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	OpenWith.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
3712	icsys.icn.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
1296	explorer.exe
4432	svchost.exe

Suspicious use of SetWindowsHookEx 18 IoCs

pid	Process
4932	Icb Temp Woofer.exe
4932	Icb Temp Woofer.exe
3712	icsys.icn.exe
3712	icsys.icn.exe
1296	explorer.exe
1296	explorer.exe
2944	spoolsv.exe
2944	spoolsv.exe
4432	svchost.exe
4432	svchost.exe
3824	spoolsv.exe
3824	spoolsv.exe
2352	OpenWith.exe
5988	OpenWith.exe
5692	OpenWith.exe
5100	OpenWith.exe
5456	OpenWith.exe
552	OpenWith.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 5408	4932	Icb Temp Woofer.exe	88
PID 4932 wrote to memory of 3712	4932	Icb Temp Woofer.exe	89
PID 3712 wrote to memory of 1296	3712	icsys.icn.exe	90
PID 1296 wrote to memory of 2944	1296	explorer.exe	91
PID 2944 wrote to memory of 4432	2944	spoolsv.exe	92
PID 4432 wrote to memory of 3824	4432	svchost.exe	93

C:\Users\Admin\AppData\Local\Temp\Icb Temp Woofer.exe
"C:\Users\Admin\AppData\Local\Temp\Icb Temp Woofer.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4932
- \??\c:\users\admin\appdata\local\temp\icb temp woofer.exe
  "c:\users\admin\appdata\local\temp\icb temp woofer.exe "
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  PID:5408
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3712
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visibility of hidden/system files in Explorer
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1296
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2944
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visibility of hidden/system files in Explorer
        Executes dropped EXE
        Adds Run key to start application
        Drops file in System32 directory
        System Location Discovery: System Language Discovery
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:4432
      - \??\c:\windows\resources\spoolsv.exe
        
        c:\windows\resources\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:3824

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:2352

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:5988

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:5692

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:5100

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:5456

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:552

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

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

Replay Monitor

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Downloads

icb temp woofer.exe

Path C:\Users\Admin\AppData\Local\Temp\icb temp woofer.exe
Size 14KB
SHA256 a3d5715a81f2fbeb5f76c88c9c21eeee87142909716472f911ff6950c790c24d
MD5 19dbec50735b5f2a72d4199c4e184960
SHA1 6fed7732f7cb6f59743795b2ab154a3676f4c822
SHA512 aa8a6bbb1ec516d5d5acf8be6863a4c6c5d754cee12b3d374c3a6acb393376806edc422f0ffb661c210e5b9485da88521e4a0956a4b7b08a5467cfaacd90591d
SSDEEP 192:sIvxdXSQeWSg9JJS/lcIEiwqZKBkDFR43xWTM3LHn8f26gyr6yfFCj3r:sMVSaSEglcIqq3agmLc+6gyWqFCj
TLSH
T180624BCFBE204417D8F0C57530659234DFBACABA1B968EDF9CF91E529AC4C072823265
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

explorer.exe

Path C:\Windows\Resources\Themes\explorer.exe
Size 135KB
SHA256 b196283d03a81fdff77a0e2254442bf1b29d46cd459f3fcf8d7201359932018c
MD5 eb6314b4eb42bd0e3f8c3d5e8646fe59
SHA1 b8144a1b7c68838c1d28ac2a58a74ed4ea352487
SHA512 3c8f3f5e3aeabc3436f48760091e9cef92456ff1fc982fb0805468d340cfdf4643477ff5820431054274bffeafb36c4649fc2245e1c46c90dd272710babdbfeb
SSDEEP 1536:UfsEqouTRcG/Mzvgf7xEuvnXNTRdUzwTekUOisZ1yDDajtXbVXG:UVqoCl/YgjxEufVU0TbTyDDalRG
TLSH
T1F3D31823BE51182FC46185F128A8F7AEBB555F3A1FD09D0336A6BB04687464372F621F
MD5 SHA1 SHA512 SSDEEP TLSH

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icsys.icn.exe

Path C:\Windows\Resources\Themes\icsys.icn.exe
Size 135KB
SHA256 b6ea22a6d47b93a607bffad199ef157bc8579d00e9ab6ed08be553188f74cde3
MD5 a1f4c724f5901d50a109af26fd5abba3
SHA1 03b3c0e2dee4fc14d72cefd3090be37a19863f5f
SHA512 134f9f158138cd8b714501d57595fba561db7dce60dc23527336dcf9f1a0c916341b58531e40f0659c4587358329f87785584e1aeb33bfef8d6e2e64a639fc6e
SSDEEP 3072:UVqoCl/YgjxEufVU0TbTyDDalRDFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFW2:UsLqdufVUNDavFWFWFWFWFWFWFWFWFWJ
TLSH
T1B4D30813AE50542FE855C9F028A9F66ABA155F361F90EE03B6D6BB0435B6143B2F130F
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

spoolsv.exe

Path C:\Windows\Resources\spoolsv.exe
Size 135KB
SHA256 60421db95af24b4d4a5fb0704e271cc98367c9f5c495264dd9e756335f75d431
MD5 18a5ecc84010bfe27879eee76e2df6a2
SHA1 20a92a0c79045ccad9b7875713fbbb67c2e2a6a6
SHA512 246ff4ba7efea16df56fb2b6bd9d99699d917cf84c6e5a4705bd74a6004d5bd16b8487d7a55fe511dc705f994881cb9e467a1c88307cdd63f8fa0778f6ac1d50
SSDEEP 1536:UfsEqouTRcG/Mzvgf7xEuvnXNTRdUzwTekUOisZ1yDDajtXbVX9:UVqoCl/YgjxEufVU0TbTyDDalR9
TLSH
T1F0D30A27FE10642FD42689F06CEAEA6EBA614E351FD4AD077297BB16247150372F420F
MD5 SHA1 SHA512 SSDEEP TLSH

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svchost.exe

Path C:\Windows\Resources\svchost.exe
Size 135KB
SHA256 26cf4c599093423fc1f35776a16c5ddc4183c880eb08cf14678228b2a7f14d73
MD5 c5f0e64cdb93922ec65bb60564a357e4
SHA1 f472bebc45e1f52f74999b959f7e8a03afba182f
SHA512 ad0e64e781f8e0d3a75f418574042aa39e1dc9053a859145f4ff821cfeb564eba15eee4d997607b7116e59c89663746d5382c39442e340cbaa980d763e1cc159
SSDEEP 1536:UfsEqouTRcG/Mzvgf7xEuvnXNTRdUzwTekUOisZ1yDDajtXbVXj:UVqoCl/YgjxEufVU0TbTyDDalRj
TLSH
T1AAD309237E50941EE92189F268A4DA6DF9251F351BE07D476392FB0069F1683B2F831F
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1296-53-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2944-50-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3712-51-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3712-15-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3824-49-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/4432-54-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/4932-0-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/4932-52-0x0000000000400000-0x000000000041F000-memory.dmp

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