1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59

Analysis

max time kernel
146s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20240221-en
resource tags

arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system
submitted
25/02/2024, 06:32

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General

Target
1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe
Size 203KB
Sample240225-ha44naef2y
SHA256 1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59
MD5 76c331668b51a48596018a3d15cbbf51
SHA1 b6084b86ec6ce7edf876a75989ed400a271925d5
SHA512 ed63b8a8ba6bfd851323630b6ca34dd15146b0af290f6ea4410d25d6ad075738874d990496673c3d61309b6daf397c59302b2d57753ed22378c0d6190c20cd7d
SSDEEP 3072:fP5gvNVLIfHQja1RfmLQADwSKkhU+tLgT5lODbiC8r1PkT:X2vnSwjaOcADw9cUeCOf
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

bootkit persistence spyware stealer

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2528	yxaky.exe

Executes dropped EXE 2 IoCs

pid	Process
2528	yxaky.exe
3728	zgk.exe

Loads dropped DLL 1 IoCs

pid	Process
3728	zgk.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1790404759-2178872477-2616469472-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Depend = "c:\\Program Files\\kbyfbk\\zgk.exe \"c:\\Program Files\\kbyfbk\\zgkpk.dll\",Compliance"	zgk.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\x:	zgk.exe
File opened (read-only)	\??\g:	zgk.exe
File opened (read-only)	\??\h:	zgk.exe
File opened (read-only)	\??\m:	zgk.exe
File opened (read-only)	\??\t:	zgk.exe
File opened (read-only)	\??\v:	zgk.exe
File opened (read-only)	\??\b:	zgk.exe
File opened (read-only)	\??\a:	zgk.exe
File opened (read-only)	\??\e:	zgk.exe
File opened (read-only)	\??\j:	zgk.exe
File opened (read-only)	\??\k:	zgk.exe
File opened (read-only)	\??\p:	zgk.exe
File opened (read-only)	\??\r:	zgk.exe
File opened (read-only)	\??\s:	zgk.exe
File opened (read-only)	\??\u:	zgk.exe
File opened (read-only)	\??\i:	zgk.exe
File opened (read-only)	\??\l:	zgk.exe
File opened (read-only)	\??\n:	zgk.exe
File opened (read-only)	\??\o:	zgk.exe
File opened (read-only)	\??\q:	zgk.exe
File opened (read-only)	\??\w:	zgk.exe
File opened (read-only)	\??\y:	zgk.exe
File opened (read-only)	\??\z:	zgk.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	zgk.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\kbyfbk	yxaky.exe
File created	\??\c:\Program Files\kbyfbk\zgkpk.dll	yxaky.exe
File created	\??\c:\Program Files\kbyfbk\zgk.exe	yxaky.exe
File opened for modification	\??\c:\Program Files\kbyfbk\zgk.exe	yxaky.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	zgk.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	zgk.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
400	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3728	zgk.exe
3728	zgk.exe
3728	zgk.exe
3728	zgk.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3728	zgk.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4812	1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe
2528	yxaky.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4812 wrote to memory of 2684	4812	1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe	86
PID 4812 wrote to memory of 2684	4812	1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe	86
PID 4812 wrote to memory of 2684	4812	1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe	86
PID 2684 wrote to memory of 400	2684	cmd.exe	88
PID 2684 wrote to memory of 400	2684	cmd.exe	88
PID 2684 wrote to memory of 400	2684	cmd.exe	88
PID 2684 wrote to memory of 2528	2684	cmd.exe	91
PID 2684 wrote to memory of 2528	2684	cmd.exe	91
PID 2684 wrote to memory of 2528	2684	cmd.exe	91
PID 2528 wrote to memory of 3728	2528	yxaky.exe	92
PID 2528 wrote to memory of 3728	2528	yxaky.exe	92
PID 2528 wrote to memory of 3728	2528	yxaky.exe	92

C:\Users\Admin\AppData\Local\Temp\1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe
"C:\Users\Admin\AppData\Local\Temp\1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4812
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\yxaky.exe "C:\Users\Admin\AppData\Local\Temp\1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2684
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:400
- - C:\Users\Admin\AppData\Local\Temp\yxaky.exe
    C:\Users\Admin\AppData\Local\Temp\\yxaky.exe "C:\Users\Admin\AppData\Local\Temp\1b45f6fa5193f942e7b6b31c1e682f57dd102167c202ddb5d1092582396eac59.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2528
  - - \??\c:\Program Files\kbyfbk\zgk.exe
      "c:\Program Files\kbyfbk\zgk.exe" "c:\Program Files\kbyfbk\zgkpk.dll",Compliance C:\Users\Admin\AppData\Local\Temp\yxaky.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3728

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

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

zgk.exe

Path C:\Program Files\kbyfbk\zgk.exe
Size 60KB
SHA256 6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910
MD5 889b99c52a60dd49227c5e485a016679
SHA1 8fa889e456aa646a4d0a4349977430ce5fa5e2d7
SHA512 08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641
SSDEEP 1536:H9ykYCTdiHQKrFXmw2RQln5IUmDjoX6+:HlMHprF2nRQln5I
MD5 SHA1 SHA512 SSDEEP

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yxaky.exe

Path C:\Users\Admin\AppData\Local\Temp\yxaky.exe
Size 203KB
SHA256 6a38cb4290dfc7cd6127b9e5f66c91724823358d22c8c2a611ab888c4a5a6bb8
MD5 09ac503ea79d22aee604ac8d5248b89c
SHA1 374f0b51fc0ce506d59580e201467283e3eb933f
SHA512 64c56f1adb5659f226a4cde7b55b63da8ea3b70990a627eccecd9c247f51d2880e9d2f3a7dc948c6de04eb7670b9e49cf392a3732f001dda355476055f3f77e3
SSDEEP 3072:fP5gvNVLIfHQja1RfmLQADwSKkhU+tLgT5lODbiC8r1PkT/:X2vnSwjaOcADw9cUeCOfV
MD5 SHA1 SHA512 SSDEEP

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zgkpk.dll

Path \??\c:\Program Files\kbyfbk\zgkpk.dll
Size 141KB
SHA256 3ae4bf2e9531ae0b6f0e4a7307d3fe860b084c98d3980a2afbb842493dc3344f
MD5 b08586750cff70a22a1761e09bef6894
SHA1 6a297cdd52deb11ff47ddd0a1215a93ccedd30cd
SHA512 47d75641c39489e158bdd997cea1b438db544e1b69540ee6a3e0cc9249b36946ba6f607cf495c2c046d4b08b5ccedcbe2e3ab7a4dd6ef590db1d3c76be74e43e
SSDEEP 3072:RGmRmNJToTJfp2D1QzpSyiJEkGSPf1bc4lw:RGMmfToTJY6zpSyvkGSn1tlw
MD5 SHA1 SHA512 SSDEEP

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memory/2528-9-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/2528-10-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/2528-15-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/3728-19-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/3728-20-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/3728-22-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/3728-29-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/4812-4-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/4812-0-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/4812-2-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/4812-1-0x0000000000400000-0x000000000044901D-memory.dmp

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