farfli | 4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
07/05/2026, 10:01

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General

Target
4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe
Size 101KB
Sample260507-l2akxaa191
SHA256 4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62
MD5 d9711c1b7267c9d263509db5bed81272
SHA1 c78c2ff759ce6f966f28638af15c7ec17f10bcd4
SHA512 1a60fea0d9f5d7699ba015a4ef6ac2ea7761d3c046ff5c4fd7036fdf7c4b952a90a5915a0c91e9ab0d06bc0394517fbf47cc40a805cea23ef032c52e97855bd1
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T1DCA3AE42ABF08761E0629DB506735B629E73FC2B193482677BD6B70EAC34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli persistence spyware stealer

Malware Config

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli

Detects Farfli Backdoor 4 IoCs

resource	yara_rule
behavioral2/memory/1520-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/1520-13-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/1520-14-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/1520-16-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Badlisted process makes network request 15 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
1	1520	rundll32.exe
2	1520	rundll32.exe
3	1520	rundll32.exe
4	1520	rundll32.exe
5	1520	rundll32.exe
6	1520	rundll32.exe
7	1520	rundll32.exe
8	1520	rundll32.exe
9	1520	rundll32.exe
10	1520	rundll32.exe
13	1520	rundll32.exe
14	1520	rundll32.exe
15	1520	rundll32.exe
16	1520	rundll32.exe
17	1520	rundll32.exe

Deletes itself 1 IoCs

pid	Process
576	hgobg.exe

Executes dropped EXE 1 IoCs

pid	Process
576	hgobg.exe

Loads dropped DLL 1 IoCs

pid	Process
1520	rundll32.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-1-5-21-3119821332-640943685-2562343641-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\tjbkn\\cgunly.dll\",GetWindowClass"	rundll32.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)	\??\g:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.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	rundll32.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	hgobg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
2264	cmd.exe
4012	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	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4012	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1520	rundll32.exe
1520	rundll32.exe
1520	rundll32.exe
1520	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1520	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1056	4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe
576	hgobg.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1056 wrote to memory of 2264	1056	4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe	79
PID 2264 wrote to memory of 4012	2264	cmd.exe	81
PID 2264 wrote to memory of 576	2264	cmd.exe	82
PID 576 wrote to memory of 1520	576	hgobg.exe	83

C:\Users\Admin\AppData\Local\Temp\4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe
"C:\Users\Admin\AppData\Local\Temp\4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1056
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\hgobg.exe "C:\Users\Admin\AppData\Local\Temp\4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2264
- - 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:4012
- - \??\c:\hgobg.exe
    c:\hgobg.exe "C:\Users\Admin\AppData\Local\Temp\4b9ad88501c5fab5acdeb8b787ccbde5ded7327e5aab595721ab23d914208f62.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:576
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\tjbkn\cgunly.dll",GetWindowClass c:\hgobg.exe
      4⤵
      Badlisted process makes network request
      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:1520

Network

MITRE ATT&CK Enterprise v16

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

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Downloads

hgobg.exe

Path C:\hgobg.exe
Size 101KB
SHA256 71257636e20d553fcc534cab3266b5ca6ea3589c6f84cf00bbb1e2412a265677
MD5 108a1843829e57e82381f304a3e07723
SHA1 af28c20283d8680b73267230a36063dfe299be94
SHA512 75d5a834ecde2d758adbab8350efda633744a997b84aeb81a5a57343f5226a4b044e0dc8f15b2fb3a59465627562d38ce94cbe319f60994afecc2e3192f7b2db
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48J:piAXaKDeKNnD36cb8tI8J
TLSH
T101A3AE42ABF08761E0629DB506735B629E73FC2B193482677BD6B70EAC34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

cgunly.dll

Path C:\tjbkn\cgunly.dll
Size 46KB
SHA256 f57f9e54f4774c2b944fb070ae0c2a02cbb4b7686ab3207544c3ccaff0ff3dd9
MD5 a3fd41430ddcaa55fde840788925406a
SHA1 dbdd87f5c1bbf6a6f44c2e2c4744675d5e4e75c2
SHA512 23109572cfc9a282ea3ec84d93bfe02303d27f365ad2d9f47f6234f91da14c64f80133cc5e49746dfcb65d2454b7e7c13eff59ba4bbc18e09d2fb1c630ba59c9
SSDEEP 768:2sUfnvxs6iLlhpfFPtnQf7kifD/v7yb9Bh7Cb0VQJojZC/xjTk:2sJT1qf4W/vub9nnV1jZC/xE
TLSH
T19D2302C8A6F08EF3D2F90B7980E046DCDCFDB939877381150566008E7C71057FA446AA
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/576-9-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/576-8-0x0000000000970000-0x0000000000A82000-memory.dmp

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memory/1056-2-0x0000000000A30000-0x0000000000B42000-memory.dmp

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memory/1056-3-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/1056-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/1520-13-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/1520-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/1520-14-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/1520-15-0x0000000000AC0000-0x0000000000BD2000-memory.dmp

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memory/1520-16-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/1520-19-0x0000000000AC0000-0x0000000000BD2000-memory.dmp

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memory/1520-29-0x0000000000AC0000-0x0000000000BD2000-memory.dmp

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memory/1520-30-0x0000000000AC0000-0x0000000000BD2000-memory.dmp

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