farfli | d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385

Analysis

max time kernel
149s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
21/04/2026, 11:14

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe
Size 102KB
Sample260421-ncawgsgy21
SHA256 d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385
MD5 749c2f00a29bcbb4dfd80ee4e9994847
SHA1 d4dc40ad7016d9a4ee760a9dc79b9a6ddc6e3310
SHA512 8780a81b24386e99c1248d7424389362c2b82e56bd4f59aab1470a130464aad48f07543677e4a3d7b7863bf4bde004f4ab225320dbb0e940edfa24bdf9b6d0b7
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T184A3AD42ABF08661E06199B506735B629EB3FC2B193482677BD7B70EAC34F40EE21355
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 1 IoCs

resource	yara_rule
behavioral2/memory/5672-13-0x0000000010000000-0x000000001002E000-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	5672	rundll32.exe
3	5672	rundll32.exe
2	5672	rundll32.exe
4	5672	rundll32.exe
5	5672	rundll32.exe
6	5672	rundll32.exe
7	5672	rundll32.exe
8	5672	rundll32.exe
9	5672	rundll32.exe
10	5672	rundll32.exe
13	5672	rundll32.exe
14	5672	rundll32.exe
15	5672	rundll32.exe
16	5672	rundll32.exe
17	5672	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3760	yxjjkrz.exe

Executes dropped EXE 1 IoCs

pid	Process
3760	yxjjkrz.exe

Loads dropped DLL 1 IoCs

pid	Process
5672	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-1-5-21-2397528088-2630719772-1129911217-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\hdrwemmk\\yakixyz.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)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\h:	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)	\??\m:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\e:	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)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\r:	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	d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.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	yxjjkrz.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
5512	cmd.exe
4700	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4700	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5672	rundll32.exe
5672	rundll32.exe
5672	rundll32.exe
5672	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5672	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4832	d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe
3760	yxjjkrz.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4832 wrote to memory of 5512	4832	d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe	78
PID 5512 wrote to memory of 4700	5512	cmd.exe	80
PID 5512 wrote to memory of 3760	5512	cmd.exe	81
PID 3760 wrote to memory of 5672	3760	yxjjkrz.exe	82

C:\Users\Admin\AppData\Local\Temp\d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe
"C:\Users\Admin\AppData\Local\Temp\d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4832
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\yxjjkrz.exe "C:\Users\Admin\AppData\Local\Temp\d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:5512
- - 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:4700
- - \??\c:\yxjjkrz.exe
    c:\yxjjkrz.exe "C:\Users\Admin\AppData\Local\Temp\d8104e416069e11a886663401e93b636a445db137d53cd836cf8f5a644b64385.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3760
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\hdrwemmk\yakixyz.dll",GetWindowClass c:\yxjjkrz.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:5672

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

Replay Monitor

Loading Replay Monitor...

Downloads

yxjjkrz.exe

Path C:\yxjjkrz.exe
Size 102KB
SHA256 b33d9d292e5b579bf68610f850e60fff83f61c6f440e123fc99b5c736f616334
MD5 f8806474053c3dd26028dd14f5f7e004
SHA1 6b4334ffe65bce767811bf3cd08148bb48f3fb5c
SHA512 b7688b5e6f96b7494d4bd5b18d60d62f26045b7bdfba0f434d8b5d156441b205b533171f192af61dfde472759134f1bcf28a378c497a1949cb86684d292a5483
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T13CA3AD42ABF08661E06199B506735B629EB3FC2B193482677BD7B70EAC34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

yakixyz.dll

Path \??\c:\hdrwemmk\yakixyz.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

Submit Download

memory/3760-7-0x0000000000400000-0x000000000041A000-memory.dmp

Download

memory/4832-0-0x0000000000400000-0x000000000041A000-memory.dmp

Download

memory/4832-2-0x0000000000400000-0x000000000041A000-memory.dmp

Download

memory/5672-10-0x0000000010000000-0x000000001002E000-memory.dmp

Download

memory/5672-11-0x0000000002F40000-0x0000000002F47000-memory.dmp

Download

memory/5672-13-0x0000000010000000-0x000000001002E000-memory.dmp

Download

memory/5672-12-0x0000000003A40000-0x0000000003AA4000-memory.dmp

Download