farfli | cfb7b0abfc1a8a827fde81bbbacb458967deb2293266e7afff0d51a0b5d09cf5

Analysis

max time kernel
150s
max time network
140s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
09/11/2026, 12:45

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General

Target
2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.exe
Size 142KB
Sample261109-pze96afe62
SHA256 cfb7b0abfc1a8a827fde81bbbacb458967deb2293266e7afff0d51a0b5d09cf5
MD5 145ee336e2cb67b8f533b3753bde60d9
SHA1 2e2c1ed3b893a4651cdc7960ac3f3d7caf2c6b3b
SHA512 0130b1333ed3e0d442d2ac3cbaf32edcd6941bfcdd6d105cd7748f9158851df18c12938fac69eb4940a091174f6140d8e37702acd06c448e652640f9eb667ab3
SSDEEP 1536:B3aacz2htqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9q:Ua/qc9rqzMseNoVv9EJFnM8q
TLSH
T118E3370263E6C194F1B30A34CA3646F08B7ABCA9FA70921B17407E5EBD31A55ED21777
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion discovery execution farfli persistence spyware stealer upx

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/4260-9-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/4260-10-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/4260-11-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli
behavioral2/memory/4260-12-0x0000000010001000-0x0000000010021000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4260-9-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4260-11-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Custom signature

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/2068-0-0x0000000000400000-0x0000000000423000-memory.dmp	UPX
behavioral2/memory/2068-2-0x0000000000400000-0x0000000000423000-memory.dmp	UPX
behavioral2/files/0x0009000000019cb3-3.dat	UPX
behavioral2/memory/1364-6-0x0000000000400000-0x0000000000423000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
8	4260	rundll32.exe
10	4260	rundll32.exe
11	4260	rundll32.exe
12	4260	rundll32.exe
13	4260	rundll32.exe
14	4260	rundll32.exe
16	4260	rundll32.exe
17	4260	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
1364	gxulk.exe

Executes dropped EXE 1 IoCs

pid	Process
1364	gxulk.exe

Loads dropped DLL 1 IoCs

pid	Process
4260	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-1-5-21-53044966-3830981193-2402648431-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\tykew\\dvfmk.dll\",init"	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)	\??\h:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	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

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2068-0-0x0000000000400000-0x0000000000423000-memory.dmp	upx
behavioral2/memory/2068-2-0x0000000000400000-0x0000000000423000-memory.dmp	upx
behavioral2/files/0x0009000000019cb3-3.dat	upx
behavioral2/memory/1364-6-0x0000000000400000-0x0000000000423000-memory.dmp	upx

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
1724	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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.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	gxulk.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
2640	PING.EXE
1724	cmd.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
2640	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4260	rundll32.exe
4260	rundll32.exe
4260	rundll32.exe
4260	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4260	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2068	2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.exe
1364	gxulk.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2068 wrote to memory of 1724	2068	2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.exe	89
PID 1724 wrote to memory of 2640	1724	cmd.exe	91
PID 1724 wrote to memory of 1364	1724	cmd.exe	92
PID 1364 wrote to memory of 4260	1364	gxulk.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2068
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\gxulk.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.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:1724
- - 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:2640
- - \??\c:\gxulk.exe
    c:\gxulk.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-07_145ee336e2cb67b8f533b3753bde60d9_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1364
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\tykew\dvfmk.dll",init c:\gxulk.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:4260

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

gxulk.exe

Path \??\c:\gxulk.exe
Size 142KB
SHA256 9899806c94e6f6ea4ef9e7def693be1d18430cb298414c0770da75859873be46
MD5 e78852c405ed35b19dcb7d8358a1d460
SHA1 3d78a57025c6102f44f3f8514a5e0e537a202a32
SHA512 00a4e2efe529d15b5f95e996a0b31b77b83ba94d31ed0f6451483836a7400807078c01c6e2e3417f36f55acf25073bd55193251a992e44d1d43e2c88ec857ed2
SSDEEP 1536:B3aacz2htqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9qs:Ua/qc9rqzMseNoVv9EJFnM8qs
TLSH
T1A5E3370263E6C194F1B30A34CA3646F08B7ABCA9FA70921B17407E5EBD31A55ED21777
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

dvfmk.dll

Path \??\c:\tykew\dvfmk.dll
Size 50KB
SHA256 a632527bcd457c9a4cfce83e7a9a675baff790b0279de5d8ea3192dfb2dd888a
MD5 ab32c5bfd7ecfbe9ed733dfb81210933
SHA1 4d5c6e7a0031691f12e78b096ff928b0d55bdfab
SHA512 59b971146292074d76d23d5f26889108f4d6e33804332449f4c589bf8a8d53e37ac8dfea47e9d3c5ae0f382ae1acf25c4968bea87b3f5ff9d51f2274229c1ab5
SSDEEP 1536:mrrG57ZqLLpf+Xz+HOtygmRnO/x5Rq8Gm:mwKGqutWM/x281
TLSH
T12033F1F4EFB4E067ECBA5F743E6A6215DA727B10C63188EA518090135F335CACA18717
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1364-6-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/2068-0-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/2068-2-0x0000000000400000-0x0000000000423000-memory.dmp

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memory/4260-9-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/4260-10-0x0000000010001000-0x0000000010021000-memory.dmp

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memory/4260-11-0x0000000010000000-0x0000000010032000-memory.dmp

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memory/4260-12-0x0000000010001000-0x0000000010021000-memory.dmp

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