farfli | d688f1f7109764bdf341643d358d45407b2615230b343062100a91a931c57fbf

Analysis

max time kernel
148s
max time network
143s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
25/08/2026, 23:23

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General

Target
2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_wannacry.exe
Size 97KB
Sample260825-3dfwfszfph
SHA256 d688f1f7109764bdf341643d358d45407b2615230b343062100a91a931c57fbf
MD5 92837896560f385f1d54f90651e7b3ea
SHA1 b73185d0b3648fca17e891c76c3b60baf46db2d3
SHA512 f62443f5cb35b489d47aa44b7b24d6c8cd79e6421b5b48481a21254e2e7d823bf54fee42c4cbc08a7576a8ada4008de0f13f85c21229d8b8e0a69b9e644fce28
SSDEEP 3072:NK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pA:Nl6XYeel6GGGVO+
TLSH
T161A3AE47ABA90DD5E1204DF401AB7B36537654892B25A78BC384DE0DA43EDC0DF366CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit 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 5 IoCs

resource	yara_rule
behavioral2/memory/760-10-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/760-12-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/760-13-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/760-14-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/760-15-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral2/memory/760-10-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/760-12-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/760-13-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/760-14-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/760-15-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 8 IoCs

resource	yara_rule
behavioral2/memory/1720-6-0x0000000000400000-0x0000000000417000-memory.dmp	UPX
behavioral2/files/0x000d00000001c5cb-7.dat	UPX
behavioral2/memory/760-9-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/760-10-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/760-12-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/760-13-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/760-14-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/760-15-0x0000000010000000-0x0000000010024000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
5	760	rundll32.exe
8	760	rundll32.exe
9	760	rundll32.exe
10	760	rundll32.exe
13	760	rundll32.exe
14	760	rundll32.exe
16	760	rundll32.exe
18	760	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000d00000001c5cb-7.dat	acprotect

Deletes itself 1 IoCs

pid	Process
1720	vmzcf.exe

Executes dropped EXE 1 IoCs

pid	Process
1720	vmzcf.exe

Loads dropped DLL 1 IoCs

pid	Process
760	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-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\uoyvzaflt\\xeebg.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)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	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)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	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 7 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000d00000001c5cb-7.dat	upx
behavioral2/memory/760-9-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/760-10-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/760-12-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/760-13-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/760-14-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/760-15-0x0000000010000000-0x0000000010024000-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
4856	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	2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_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	vmzcf.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
4856	cmd.exe
2676	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
2676	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
760	rundll32.exe
760	rundll32.exe
760	rundll32.exe
760	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	760	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2560	2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_wannacry.exe
1720	vmzcf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2560 wrote to memory of 4856	2560	2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_wannacry.exe	89
PID 4856 wrote to memory of 2676	4856	cmd.exe	91
PID 4856 wrote to memory of 1720	4856	cmd.exe	92
PID 1720 wrote to memory of 760	1720	vmzcf.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2560
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\vmzcf.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_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:4856
- - 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:2676
- - \??\c:\vmzcf.exe
    c:\vmzcf.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-23_92837896560f385f1d54f90651e7b3ea_elex_feodo_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1720
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\uoyvzaflt\xeebg.dll",init c:\vmzcf.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:760

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

xeebg.dll

Path \??\c:\uoyvzaflt\xeebg.dll
Size 46KB
SHA256 b6bc7902da0250f6ca920b35b222f6a0fe62102caf05d2a1722c4d3b225a0a9e
MD5 42fe886bcb6460f7c2a46e21ecac5da6
SHA1 7d9a1c9fe17121cf61444da965f29e974a95ede2
SHA512 3d1a7dc1d9ca8a4376302ba20df584ad59b98e0d3b18b06b22d7f5a455833ce124e412fc1922a3b704dcbafa31987cda3115c9a71dd6299683502cebae33567c
SSDEEP 768:P60NIyOvlPSGxZ00FBsMT0fdB5h3vU7ExCClpoduUglNgLoR/C:P6e4lP5rvz1Vd8H/C
TLSH
T10023F15733A8577BC9E621FA3263BE142B357019CB3A83545CB9B6572C21C8D927930F
MD5 SHA1 SHA512 SSDEEP TLSH

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vmzcf.exe

Path \??\c:\vmzcf.exe
Size 97KB
SHA256 c3e5c0b2d52bd23607cbfe2753a8ce49d305f7424d1c2d2094249fa6ab7e12f9
MD5 9868276744790d6e27d834351256cb4e
SHA1 c7f112113a962e1575218e44c11022d773ef5c22
SHA512 12b287410ac7315acad73ae71fdca703c7df3610fdac5dfe09c55e4f387387956292ea49a207892ec0fec597e3c9569e713fe94f53c848df5404465cd4523a00
SSDEEP 3072:NK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pQ:Nl6XYeel6GGGVOC
TLSH
T124A3AE47ABA90DD5E1204DF401AB7B36537654892F25A78BC388DE0DA43EDC0DB366CE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/760-9-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/760-10-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/760-12-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/760-13-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/760-14-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/760-15-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1720-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2560-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2560-2-0x0000000000400000-0x0000000000417000-memory.dmp

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