farfli | e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6

Analysis

max time kernel
150s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20260911-en
resource tags

arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
01/11/2026, 04:31

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General

Target
e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.exe
Size 109KB
Sample261101-e5f4jagt6x
SHA256 e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6
MD5 f0425a922253c43b1da19b10bc13802a
SHA1 7fcc62fb785500d5137d1f6f54b04220de38c5cc
SHA512 be8aafc23cd3a1d741af20ea2463f4ea59abe98b5a06cf2e767d2a591dcc0f221478b93713ffa12bd9664607c2eb5ee80ac436477e627ebc0bad0ba3fdca6906
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T1EEB39E02ABF087A5E0665DB5467717619EB2FC6A29348327B7D6B70EEC30F00EE25354
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion discovery execution 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
behavioral1/memory/3600-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral1/memory/3600-11-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral1/memory/3600-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral1/memory/3600-13-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
10	3600	rundll32.exe
11	3600	rundll32.exe
12	3600	rundll32.exe
19	3600	rundll32.exe
32	3600	rundll32.exe
37	3600	rundll32.exe
42	3600	rundll32.exe
43	3600	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4792	gzycqj.exe

Executes dropped EXE 1 IoCs

pid	Process
4792	gzycqj.exe

Loads dropped DLL 1 IoCs

pid	Process
3600	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-1-5-21-2091445952-3649787497-104050984-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\istrp\\wywtgc.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)	\??\e:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	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

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
5896	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	rundll32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	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	e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.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	gzycqj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.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
5896	cmd.exe
60	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
60	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3600	rundll32.exe
3600	rundll32.exe
3600	rundll32.exe
3600	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3600	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
6120	e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.exe
4792	gzycqj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 6120 wrote to memory of 5896	6120	e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.exe	84
PID 5896 wrote to memory of 60	5896	cmd.exe	86
PID 5896 wrote to memory of 4792	5896	cmd.exe	87
PID 4792 wrote to memory of 3600	4792	gzycqj.exe	88

C:\Users\Admin\AppData\Local\Temp\e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.exe
"C:\Users\Admin\AppData\Local\Temp\e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:6120
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\gzycqj.exe "C:\Users\Admin\AppData\Local\Temp\e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.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:5896
- - 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:60
- - \??\c:\gzycqj.exe
    c:\gzycqj.exe "C:\Users\Admin\AppData\Local\Temp\e5e7b3ad97cc8ddeb324281684f3524d92d2098e913a1a221667eaf4a2348ae6.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4792
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\istrp\wywtgc.dll",GetWindowClass c:\gzycqj.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)
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3600

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

Indicator Removal

T1070

File Deletion

T1070.004

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

gzycqj.exe

Path C:\gzycqj.exe
Size 110KB
SHA256 caf2b5f58e52b13feac986dd81f668f5638dcb5ac802248dbc5ea04792f69533
MD5 6d1dac899a8033c86c655226ecc6834f
SHA1 0be05efa3b63e4341b058c7bdbd5896c6d32f1cb
SHA512 3f087ca5add1ad3eb9d8b1d48db9feceb73edce3e0bec45a55de15183ca15e438effb67221fdc0a4d84940a8d32063d8173513aed5726bcae310eab4fc13e174
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX4T:piAXaKDeKNnD36cb8tIT
TLSH
T1EFB39D02ABF087A5E0665D7546771B619EB2FC2A29348327B7D6B70EEC30F00EE25354
MD5 SHA1 SHA512 SSDEEP TLSH

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wywtgc.dll

Path \??\c:\istrp\wywtgc.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/3600-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/3600-11-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/3600-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/3600-13-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4792-7-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/6120-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/6120-2-0x0000000000400000-0x000000000041A000-memory.dmp

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