6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c

Analysis

max time kernel
145s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
27-11-2022 15:49

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General

Target

6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe
Size

69KB
MD5

9ea38549db22318be6020b7e6c82c2d2
SHA1

0a36f31f09abbd16b433a4ed3965b9be2ff45a48
SHA256

6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c
SHA512

8b11de3c8feb278c302c7d6792dc9f19862a6b66f0fb7768cb416ee823e66d1aff2b9407c4e823a0e03ea924058aa61a5856cbb10906978e8950c326e6d19061
SSDEEP

1536:4aIdJ8LqMbEwOLc3tfnbvTzkeOFjlkHzrbq:4ah3bEwOLc3tfnvzk1vq2

Score

8^/10

persistence upx

Malware Config

Signatures

Drops file in Drivers directory 2 IoCs

Processes:

6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\drivers\kyjs.sys	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe
File created	C:\Windows\SysWOW64\drivers\kyjs.sys	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\svdra\ImagePath = "system32\\drivers\\kyjs.sys"	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe

UPX packed file 2 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3036-132-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3036-138-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Loads dropped DLL 2 IoCs

Processes:

rundll32.exeRundll32.exe

pid process

4076 rundll32.exe
3416 Rundll32.exe

pid	process
4076	rundll32.exe
3416	Rundll32.exe

Drops file in System32 directory 2 IoCs

Processes:

6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe

description	ioc	process
File created	C:\Windows\SysWOW64\GBuK.dll	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe
File opened for modification	C:\Windows\SysWOW64\GBuK.dll	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe

Suspicious behavior: LoadsDriver 1 IoCs

Processes:

pid process

652
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Rundll32.exe

pid process

3416 Rundll32.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Rundll32.exe

pid process

3416 Rundll32.exe

pid	process
652

pid	process
3416	Rundll32.exe

pid	process
3416	Rundll32.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exerundll32.exe

description	pid	process	target process
PID 3036 wrote to memory of 4076	3036	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe	rundll32.exe
PID 3036 wrote to memory of 4076	3036	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe	rundll32.exe
PID 3036 wrote to memory of 4076	3036	6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe	rundll32.exe
PID 4076 wrote to memory of 3416	4076	rundll32.exe	Rundll32.exe
PID 4076 wrote to memory of 3416	4076	rundll32.exe	Rundll32.exe
PID 4076 wrote to memory of 3416	4076	rundll32.exe	Rundll32.exe

C:\Users\Admin\AppData\Local\Temp\6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe
"C:\Users\Admin\AppData\Local\Temp\6f69a8ba90daa34a130d97c4f61089a46d21cfaed2b02422f0f1cf89ef0e5f2c.exe"
1⤵
- Drops file in Drivers directory
- Sets service image path in registry
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:3036

C:\Windows\SysWOW64\rundll32.exe
C:\Windows\system32\rundll32.exe C:\Windows\system32\GBuK.dll,DllRegisterServer
2⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:4076

C:\Windows\SysWOW64\Rundll32.exe
C:\Windows\system32\Rundll32.exe C:\Windows\system32\GBuK.dll,DllUnregisterServer
3⤵
- Loads dropped DLL
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
PID:3416

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\GBuK.dll
Filesize
48KB

MD5
9bb2b0480d12899117c5fda1b8950368

SHA1
2a2f9ad09609f977ec0d2e7cd27f046dd9440f20

SHA256
1e4ea30cfa80f871a114a2a310eb0793ad9dcfc0cc3e95e3e40aead79876f665

SHA512
542077b391dc40cd69c3b357a0cbf0dfbc7c289fd7cb7cdcbf155ece8705e769927702bd3838ad1fde88085ed0de6e08c4b1f1aa6b6a71d667b9dcbf03d1e7eb

Download Submit
C:\Windows\SysWOW64\GBuK.dll
Filesize
48KB

MD5
9bb2b0480d12899117c5fda1b8950368

SHA1
2a2f9ad09609f977ec0d2e7cd27f046dd9440f20

SHA256
1e4ea30cfa80f871a114a2a310eb0793ad9dcfc0cc3e95e3e40aead79876f665

SHA512
542077b391dc40cd69c3b357a0cbf0dfbc7c289fd7cb7cdcbf155ece8705e769927702bd3838ad1fde88085ed0de6e08c4b1f1aa6b6a71d667b9dcbf03d1e7eb

Download Submit
C:\Windows\SysWOW64\GBuK.dll
Filesize
48KB

MD5
9bb2b0480d12899117c5fda1b8950368

SHA1
2a2f9ad09609f977ec0d2e7cd27f046dd9440f20

SHA256
1e4ea30cfa80f871a114a2a310eb0793ad9dcfc0cc3e95e3e40aead79876f665

SHA512
542077b391dc40cd69c3b357a0cbf0dfbc7c289fd7cb7cdcbf155ece8705e769927702bd3838ad1fde88085ed0de6e08c4b1f1aa6b6a71d667b9dcbf03d1e7eb

Download Submit
memory/3036-132-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3036-138-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3416-136-0x0000000000000000-mapping.dmp

Download
memory/4076-133-0x0000000000000000-mapping.dmp

Download