vobfus | 13b21bf5da95f824edc00639c6cf87462c95709de4b219eb118a6534d8d5cdc3

Analysis

max time kernel
149s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
28/02/2025, 19:54

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General

Target

JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Size

62KB
MD5

342751878d07e46f3efd6b853cf06272
SHA1

1d5199f7c879f803d50fa59896f89145e67bd699
SHA256

13b21bf5da95f824edc00639c6cf87462c95709de4b219eb118a6534d8d5cdc3
SHA512

19d64331046e5ff95c99eb98dddb03a72018d504b3471478a62f9e6ea7e2460d295e5a661ecb4f38e34bddb82d8f4f0896dff320fe6be671f08ba81ea5926b64
SSDEEP

1536:zPu7RNHlimXv8ikO+hBXT7G/5Pa0C9+XLUY:QL7vV+hp7Sap+bUY

Score

10^/10

vobfus discovery persistence upx worm

Malware Config

Signatures

Vobfus
A widespread worm which spreads via network drives and removable media.
worm vobfus
Vobfus family
vobfus

Adds policy 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\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\AIGILQI7ZEAV5 = "C:\\Users\\Admin\\AppData\\Roaming\\6YWFCUHF.exe"	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Key created	\REGISTRY\USER\S-1-5-21-1170604239-850860757-3112005715-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1170604239-850860757-3112005715-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\AIGILQI7ZEAV5 = "C:\\Users\\Admin\\AppData\\Roaming\\6YWFCUHF.exe"	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	JaffaCakes118_342751878d07e46f3efd6b853cf06272.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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\AIGILQI7ZEAV5 = "C:\\Users\\Admin\\AppData\\Roaming\\6YWFCUHF.exe"	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1170604239-850860757-3112005715-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\AIGILQI7ZEAV5 = "C:\\Users\\Admin\\AppData\\Roaming\\6YWFCUHF.exe"	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4152 set thread context of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/640-1-0x0000000000400000-0x0000000000543000-memory.dmp	upx
behavioral2/memory/640-3-0x0000000000400000-0x0000000000543000-memory.dmp	upx
behavioral2/memory/640-5-0x0000000000400000-0x0000000000543000-memory.dmp	upx
behavioral2/memory/640-10-0x0000000000400000-0x0000000000543000-memory.dmp	upx
behavioral2/memory/640-11-0x0000000000400000-0x0000000000543000-memory.dmp	upx
behavioral2/memory/640-32-0x0000000000400000-0x0000000000543000-memory.dmp	upx
behavioral2/memory/640-51-0x0000000000400000-0x0000000000543000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 14 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	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Script User-Agent 1 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	30	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 4152 wrote to memory of 640	4152	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	87
PID 640 wrote to memory of 1128	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	95
PID 640 wrote to memory of 1128	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	95
PID 640 wrote to memory of 1128	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	95
PID 640 wrote to memory of 372	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	97
PID 640 wrote to memory of 372	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	97
PID 640 wrote to memory of 372	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	97
PID 640 wrote to memory of 1380	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	107
PID 640 wrote to memory of 1380	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	107
PID 640 wrote to memory of 1380	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	107
PID 640 wrote to memory of 1592	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	108
PID 640 wrote to memory of 1592	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	108
PID 640 wrote to memory of 1592	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	108
PID 640 wrote to memory of 3336	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	109
PID 640 wrote to memory of 3336	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	109
PID 640 wrote to memory of 3336	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	109
PID 640 wrote to memory of 2956	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	112
PID 640 wrote to memory of 2956	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	112
PID 640 wrote to memory of 2956	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	112
PID 640 wrote to memory of 1068	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	113
PID 640 wrote to memory of 1068	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	113
PID 640 wrote to memory of 1068	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	113
PID 640 wrote to memory of 4668	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	114
PID 640 wrote to memory of 4668	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	114
PID 640 wrote to memory of 4668	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	114
PID 640 wrote to memory of 2128	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	116
PID 640 wrote to memory of 2128	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	116
PID 640 wrote to memory of 2128	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	116
PID 640 wrote to memory of 372	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	117
PID 640 wrote to memory of 372	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	117
PID 640 wrote to memory of 372	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	117
PID 640 wrote to memory of 4312	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	118
PID 640 wrote to memory of 4312	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	118
PID 640 wrote to memory of 4312	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	118
PID 640 wrote to memory of 3520	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	121
PID 640 wrote to memory of 3520	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	121
PID 640 wrote to memory of 3520	640	JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe	121

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4152
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
  C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_342751878d07e46f3efd6b853cf06272.exe
  2⤵
  - Adds policy Run key to start application
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: RenamesItself
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:640
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1128
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:372
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1380
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1592
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3336
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2956
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1068
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4668
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2128
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:372
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4312
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3520

Network

MITRE ATT&CK Enterprise v15

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

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\6ywfcuhf.exe.jpg

Filesize
62KB

MD5
342751878d07e46f3efd6b853cf06272

SHA1
1d5199f7c879f803d50fa59896f89145e67bd699

SHA256
13b21bf5da95f824edc00639c6cf87462c95709de4b219eb118a6534d8d5cdc3

SHA512
19d64331046e5ff95c99eb98dddb03a72018d504b3471478a62f9e6ea7e2460d295e5a661ecb4f38e34bddb82d8f4f0896dff320fe6be671f08ba81ea5926b64

Download Submit
memory/640-1-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/640-3-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/640-5-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/640-10-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/640-11-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/640-32-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/640-51-0x0000000000400000-0x0000000000543000-memory.dmp

Filesize
1.3MB

Download
memory/4152-0-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4152-4-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads