farfli | 39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6

Analysis

max time kernel
150s
max time network
141s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
05/08/2026, 10:44

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General

Target
39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.exe
Size 230KB
Sample260805-ms1amszthy
SHA256 39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6
MD5 a5e75650ed25049108407f6ac3f5d079
SHA1 a8bd5d682366a669de6538e5525985d1b5c8abf3
SHA512 f0e3dee8d5d55ce59ce6ba59f0dca25deabebbf4f9cdbf3d605ce3031d2b78a2aec7b6c7f70dea6f2b35b5ed09ebf9b32310d238f31b32dc51775d2715fe6a7a
SSDEEP 3072:fP5gvNVLIfHQja1RfmLQADwSKkhU+tLgT5lODbiC8r1PkTF:X2vnSwjaOcADw9cUeCOf
TLSH
T14C340200DBB2E5E8D448247A07879310EBF1DDDE7B73677143D5E22FAB41F1AA4AA190
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli gh0strat persistence rat spyware stealer

Malware Config

Extracted

Family

gh0strat

107.163.241.193:6520
http://107.163.241.181:16300/
http://107.163.241.182:12354/login.php

Attributes

user_agent
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C))

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli
Family: Gh0strat
Gh0st RAT is a remote access tool (RAT) with its source code public and it has been used by multiple Chinese groups.
rat gh0strat

Detects Farfli Backdoor 4 IoCs

resource	yara_rule
behavioral2/memory/4788-15-0x0000000010000000-0x000000001004E000-memory.dmp	family_farfli
behavioral2/memory/4788-16-0x0000000010000000-0x000000001004E000-memory.dmp	family_farfli
behavioral2/memory/4788-18-0x0000000010000000-0x000000001004E000-memory.dmp	family_farfli
behavioral2/memory/4788-21-0x0000000010000000-0x000000001004E000-memory.dmp	family_farfli

Deletes itself 1 IoCs

pid	Process
5732	ykhiswj.exe

Executes dropped EXE 2 IoCs

pid	Process
5732	ykhiswj.exe
4788	vyeyf.exe

Loads dropped DLL 1 IoCs

pid	Process
4788	vyeyf.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-1-5-21-4046655672-1449839301-2197395821-1000\Software\Microsoft\Windows\CurrentVersion\Run\Depend = "c:\\Program Files\\epynalrzz\\vyeyf.exe \"c:\\Program Files\\epynalrzz\\vyeyf.dll\",Compliance"	vyeyf.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)	\??\k:	vyeyf.exe
File opened (read-only)	\??\o:	vyeyf.exe
File opened (read-only)	\??\r:	vyeyf.exe
File opened (read-only)	\??\s:	vyeyf.exe
File opened (read-only)	\??\w:	vyeyf.exe
File opened (read-only)	\??\b:	vyeyf.exe
File opened (read-only)	\??\d:	vyeyf.exe
File opened (read-only)	\??\h:	vyeyf.exe
File opened (read-only)	\??\i:	vyeyf.exe
File opened (read-only)	\??\m:	vyeyf.exe
File opened (read-only)	\??\v:	vyeyf.exe
File opened (read-only)	\??\z:	vyeyf.exe
File opened (read-only)	\??\a:	vyeyf.exe
File opened (read-only)	\??\g:	vyeyf.exe
File opened (read-only)	\??\j:	vyeyf.exe
File opened (read-only)	\??\l:	vyeyf.exe
File opened (read-only)	\??\n:	vyeyf.exe
File opened (read-only)	\??\p:	vyeyf.exe
File opened (read-only)	\??\q:	vyeyf.exe
File opened (read-only)	\??\u:	vyeyf.exe
File opened (read-only)	\??\t:	vyeyf.exe
File opened (read-only)	\??\x:	vyeyf.exe
File opened (read-only)	\??\y:	vyeyf.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	vyeyf.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	\??\c:\Program Files\epynalrzz\vyeyf.exe	ykhiswj.exe
File opened for modification	\??\c:\Program Files\epynalrzz	ykhiswj.exe
File created	\??\c:\Program Files\epynalrzz\vyeyf.dll	ykhiswj.exe

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1436	cmd.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	39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.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	ykhiswj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vyeyf.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
1436	cmd.exe
2604	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	vyeyf.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	vyeyf.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2604	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4788	vyeyf.exe
4788	vyeyf.exe
4788	vyeyf.exe
4788	vyeyf.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4788	vyeyf.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1572	39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.exe
5732	ykhiswj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1572 wrote to memory of 1436	1572	39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.exe	90
PID 1436 wrote to memory of 2604	1436	cmd.exe	92
PID 1436 wrote to memory of 5732	1436	cmd.exe	93
PID 5732 wrote to memory of 4788	5732	ykhiswj.exe	94

C:\Users\Admin\AppData\Local\Temp\39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.exe
"C:\Users\Admin\AppData\Local\Temp\39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1572
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\ykhiswj.exe "C:\Users\Admin\AppData\Local\Temp\39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.exe"
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1436
- - 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:2604
- - C:\Users\Admin\AppData\Local\Temp\ykhiswj.exe
    C:\Users\Admin\AppData\Local\Temp\\ykhiswj.exe "C:\Users\Admin\AppData\Local\Temp\39b8cddc4c5db3bb653f1dd03b42e5c7e7bff7a58f169865fbaa5e53196c36a6.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:5732
  - - \??\c:\Program Files\epynalrzz\vyeyf.exe
      "c:\Program Files\epynalrzz\vyeyf.exe" "c:\Program Files\epynalrzz\vyeyf.dll",Compliance C:\Users\Admin\AppData\Local\Temp\ykhiswj.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:4788

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

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

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Downloads

vyeyf.exe

Path C:\Program Files\epynalrzz\vyeyf.exe
Size 51KB
SHA256 ce6bb7eddc83762c708d4a41709ae00371dbdc09b2a380f28fa60b1edf917473
MD5 2e068ce2770fde8d1af4cb114b98df1f
SHA1 b6f9c2775babb025b22f915c3047aa627d07c312
SHA512 998d695eb56375e63df7db16740b89deb2cf630ccbead8bcf84a921ec6f4a4f9aef2755b703f7190f332b2008ebcc949363bcf8f392d7d07246c255b5073ed35
SSDEEP 1536:6G9yoVEpHP29I3fbcJboSUge5N+CnC/maz9Rh:8pv2mbcJboce58wvOR
TLSH
T137336C236A0A49B3DFE231780A9D7232526DD862075541F7A61057EAFD243E2EE743CF
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

ykhiswj.exe

Path C:\Users\Admin\AppData\Local\Temp\ykhiswj.exe
Size 230KB
SHA256 52eaf34461f3e253007c138fc280470459a7ffa41d5ae26a405cd0283671153e
MD5 7e3da835fed84f1f0a9cdf2c48cdfb0c
SHA1 9d8f740b47d0600ac1ab9437971bcaed325d5831
SHA512 b2113d605725694415083cb5005fb3c7904f4b10341bdbb325f01ed0dfcb1a0b2d595fd294bb53c9e38d4ad8529eec4294b8e3fb954c67b61bdb386d523076b3
SSDEEP 3072:fP5gvNVLIfHQja1RfmLQADwSKkhU+tLgT5lODbiC8r1PkTF8:X2vnSwjaOcADw9cUeCOf8
TLSH
T1BD340200DBB2E5E8D448247A07879310EBF1DDDE7B73677143D5E22FAB41F1AA4AA190
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

vyeyf.dll

Path \??\c:\Program Files\epynalrzz\vyeyf.dll
Size 141KB
SHA256 bfe7e337b445d25fa0973122408cfd882c10ba63ab2a5739406e41533555e2e2
MD5 ee47efd38f09b1ee27de37d24ceabe9a
SHA1 5dc1d85143df53df3e2b42577f7df93933dba208
SHA512 bc09293daa4d1906c631cd16ce7e5a3cdd2a78765b416eb5733e460ce15f57b6c216cb8bd5f8e460caaacd8d7620515ce8a0dc666fae39dcef188b93488294c8
SSDEEP 3072:RGmRmNJToTJfp2D1QzpSyiJEkGSPf1bc4lt:RGMmfToTJY6zpSyvkGSn1tlt
TLSH
T126E302E0E3B7C4BAC269573147937DF31618F4346B18072AFD62A32769394C84B9DB1A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1572-1-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/1572-2-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/1572-4-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/1572-0-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/4788-16-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/4788-21-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/4788-18-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/4788-15-0x0000000010000000-0x000000001004E000-memory.dmp

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memory/5732-7-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/5732-12-0x0000000000400000-0x000000000044901D-memory.dmp

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memory/5732-8-0x0000000000400000-0x000000000044901D-memory.dmp

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