b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8

Analysis

max time kernel
118s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10/11/2024, 04:14

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General

Target
b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe
Size 149KB
Sample241110-etvsjszanq
SHA256 b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8
MD5 a4fc3112f925412f1b6f29b4db25a3a0
SHA1 baa031be9b4663fa5b6c74e44d9f3b238a4035bc
SHA512 32c7ec5ba914aac320ee20721e5905944d0a62f05f8d871339815a779c5f8dbc3ac4e2dad6aec735a212b6d610400683336bbd3b423da2df1770209720be657a
SSDEEP 3072:gOuCgsQ+rTjPQopsX2VEAhHMsuJmQWZmvwEfpp0YkiQ4:OYPVg2nhHvQWZ74p+Yj
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

bootkit discovery persistence spyware stealer

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2476	hfbkr.exe

Executes dropped EXE 2 IoCs

pid	Process
2476	hfbkr.exe
4832	yjl.exe

Loads dropped DLL 1 IoCs

pid	Process
4832	yjl.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

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-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EM = "c:\\Program Files\\allkl\\yjl.exe \"c:\\Program Files\\allkl\\yjlra.dll\",ExitModule"	yjl.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)	\??\i:	yjl.exe
File opened (read-only)	\??\j:	yjl.exe
File opened (read-only)	\??\m:	yjl.exe
File opened (read-only)	\??\r:	yjl.exe
File opened (read-only)	\??\s:	yjl.exe
File opened (read-only)	\??\u:	yjl.exe
File opened (read-only)	\??\v:	yjl.exe
File opened (read-only)	\??\a:	yjl.exe
File opened (read-only)	\??\e:	yjl.exe
File opened (read-only)	\??\h:	yjl.exe
File opened (read-only)	\??\q:	yjl.exe
File opened (read-only)	\??\w:	yjl.exe
File opened (read-only)	\??\z:	yjl.exe
File opened (read-only)	\??\l:	yjl.exe
File opened (read-only)	\??\o:	yjl.exe
File opened (read-only)	\??\p:	yjl.exe
File opened (read-only)	\??\t:	yjl.exe
File opened (read-only)	\??\x:	yjl.exe
File opened (read-only)	\??\y:	yjl.exe
File opened (read-only)	\??\b:	yjl.exe
File opened (read-only)	\??\g:	yjl.exe
File opened (read-only)	\??\k:	yjl.exe
File opened (read-only)	\??\n:	yjl.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	yjl.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	\??\c:\Program Files\allkl\yjlra.dll	hfbkr.exe
File created	\??\c:\Program Files\allkl\yjl.exe	hfbkr.exe
File opened for modification	\??\c:\Program Files\allkl\yjl.exe	hfbkr.exe
File opened for modification	\??\c:\Program Files\allkl	hfbkr.exe

System Location Discovery: System Language Discovery 1 TTPs 5 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	b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	hfbkr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yjl.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1240	cmd.exe
2440	PING.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	yjl.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	yjl.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2440	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4832	yjl.exe
4832	yjl.exe
4832	yjl.exe
4832	yjl.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4832	yjl.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4564	b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe
2476	hfbkr.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4564 wrote to memory of 1240	4564	b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe	83
PID 4564 wrote to memory of 1240	4564	b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe	83
PID 4564 wrote to memory of 1240	4564	b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe	83
PID 1240 wrote to memory of 2440	1240	cmd.exe	85
PID 1240 wrote to memory of 2440	1240	cmd.exe	85
PID 1240 wrote to memory of 2440	1240	cmd.exe	85
PID 1240 wrote to memory of 2476	1240	cmd.exe	89
PID 1240 wrote to memory of 2476	1240	cmd.exe	89
PID 1240 wrote to memory of 2476	1240	cmd.exe	89
PID 2476 wrote to memory of 4832	2476	hfbkr.exe	91
PID 2476 wrote to memory of 4832	2476	hfbkr.exe	91
PID 2476 wrote to memory of 4832	2476	hfbkr.exe	91

C:\Users\Admin\AppData\Local\Temp\b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe
"C:\Users\Admin\AppData\Local\Temp\b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4564
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\hfbkr.exe "C:\Users\Admin\AppData\Local\Temp\b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1240
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2440
- - C:\Users\Admin\AppData\Local\Temp\hfbkr.exe
    C:\Users\Admin\AppData\Local\Temp\\hfbkr.exe "C:\Users\Admin\AppData\Local\Temp\b9e025d19552b6085cfd270441379c3445ec18b14dce113bb1b2f8764fd675b8N.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2476
  - - \??\c:\Program Files\allkl\yjl.exe
      "c:\Program Files\allkl\yjl.exe" "c:\Program Files\allkl\yjlra.dll",ExitModule C:\Users\Admin\AppData\Local\Temp\hfbkr.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4832

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

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

yjl.exe

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

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yjlra.dll

Path C:\Program Files\allkl\yjlra.dll
Size 81KB
SHA256 f26cddca2e1d67bae3d30de12c0985fb362d3027a9dacc69ef8fe88d2b3a8f0d
MD5 bf8eb3e9e4ec0aef88925de5f780f4a1
SHA1 cf0e377866227d3fb9e405d7f978ff3617b19c79
SHA512 642cd16587fbb5e001fc20557ecc44eff8cf7f6b8598a0cee063e2cbd54e048738c733a7f81249339f83e8fba11fd4bc744f8351ee792520cc2c1b298a8121ef
SSDEEP 1536:lCbhjW8rhK4rg6Z1qdkMB5eIO292XbNTx9sy8ifyXxyk3D3Wfn25B76Ps06DcBqY:QbhjWfe/+dkg4ZfWiKAC3W67E5nBqY
MD5 SHA1 SHA512 SSDEEP

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hfbkr.exe

Path C:\Users\Admin\AppData\Local\Temp\hfbkr.exe
Size 149KB
SHA256 3c8e834ba25f69f5909310ad0bf3b79fca2ccd911f313c78d729f3d59cc3daec
MD5 b5f4f5036f5983391d4df7230516793f
SHA1 ba000fdebb49b666e613f70b2da368abf65f19bd
SHA512 b3225dd7f8aff0135cb20661b2cb66c7b72c2af415fcce14036110344934d6e9542dadf226a621d8946ed3cca54355a33721e489d1dfc9f19806bff289a425cb
SSDEEP 3072:gOuCgsQ+rTjPQopsX2VEAhHMsuJmQWZmvwEfpp0YkiQQ:OYPVg2nhHvQWZ74p+YX
MD5 SHA1 SHA512 SSDEEP

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memory/2476-10-0x0000000000400000-0x000000000045868F-memory.dmp

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memory/4564-0-0x0000000000400000-0x000000000045868F-memory.dmp

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memory/4564-2-0x0000000000400000-0x000000000045868F-memory.dmp

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memory/4832-14-0x0000000010000000-0x000000001004D000-memory.dmp

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memory/4832-15-0x0000000010000000-0x000000001004D000-memory.dmp

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memory/4832-20-0x0000000010000000-0x000000001004D000-memory.dmp

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memory/4832-19-0x0000000010036000-0x000000001004D000-memory.dmp

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memory/4832-21-0x0000000010000000-0x000000001004D000-memory.dmp

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memory/4832-24-0x0000000010000000-0x000000001004D000-memory.dmp

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memory/4832-26-0x0000000010000000-0x000000001004D000-memory.dmp

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