farfli | 473e05a258f5ccf6962c3c597bea3f939915cf0c8f5dad202609892c42d2ef3b

Analysis

max time kernel
150s
max time network
146s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
02/08/2026, 10:30

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General

Target
2026-08-02_eac244b8bc2b8087943d3e58da8888f8_elex_wannacry.exe
Size 87KB
Sample260802-mjw7magg27
SHA256 473e05a258f5ccf6962c3c597bea3f939915cf0c8f5dad202609892c42d2ef3b
MD5 eac244b8bc2b8087943d3e58da8888f8
SHA1 84c76934e9bde3d650b7a16d776f535f648cb157
SHA512 51c4e4cf7042b323884b3f9bb677d33bc08df4a64476f7517661294c52110f7623955aaebd849ee9ef06bcf788a59ce647df944f58a557efa50fa9ccd49f1eec
SSDEEP 1536:m/14ZaKO/myxZmAijMcCwVVydoM1bKAQAH9M53e+iWtnSd:a14ZaKOTZSMcJVgDKxAH9MhtfSd
TLSH
T19D93CF232FBB4135DD44AF711E6B2665E6F2BD36212082768B5CAD8DAA3CF44DB0131C
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli persistence spyware stealer

Malware Config

Signatures

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

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/4680-11-0x0000000010000000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/4680-13-0x0000000010000000-0x0000000010021000-memory.dmp	family_farfli
behavioral2/memory/4680-14-0x0000000010000000-0x0000000010021000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4680-11-0x0000000010000000-0x0000000010021000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4680-13-0x0000000010000000-0x0000000010021000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4680-14-0x0000000010000000-0x0000000010021000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
1	4680	rundll32.exe
2	4680	rundll32.exe
3	4680	rundll32.exe
4	4680	rundll32.exe
5	4680	rundll32.exe
6	4680	rundll32.exe
7	4680	rundll32.exe
8	4680	rundll32.exe

Deletes itself 1 IoCs

pid	Process
5072	gvbos.exe

Executes dropped EXE 1 IoCs

pid	Process
5072	gvbos.exe

Loads dropped DLL 1 IoCs

pid	Process
4680	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-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\brsaz\\vbiydh.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)	\??\u:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\q:	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)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	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)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\n:	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
2580	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	2026-08-02_eac244b8bc2b8087943d3e58da8888f8_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	gvbos.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
2580	cmd.exe
3300	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
3300	PING.EXE

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4680	rundll32.exe
4680	rundll32.exe
4680	rundll32.exe
4680	rundll32.exe
4680	rundll32.exe
4680	rundll32.exe
4680	rundll32.exe
4680	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4680	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4748	2026-08-02_eac244b8bc2b8087943d3e58da8888f8_elex_wannacry.exe
5072	gvbos.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4748 wrote to memory of 2580	4748	2026-08-02_eac244b8bc2b8087943d3e58da8888f8_elex_wannacry.exe	89
PID 2580 wrote to memory of 3300	2580	cmd.exe	91
PID 2580 wrote to memory of 5072	2580	cmd.exe	92
PID 5072 wrote to memory of 4680	5072	gvbos.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-02_eac244b8bc2b8087943d3e58da8888f8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_eac244b8bc2b8087943d3e58da8888f8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4748
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\gvbos.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-02_eac244b8bc2b8087943d3e58da8888f8_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:2580
- - 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:3300
- - \??\c:\gvbos.exe
    c:\gvbos.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-02_eac244b8bc2b8087943d3e58da8888f8_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5072
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\brsaz\vbiydh.dll",GetWindowClass c:\gvbos.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:4680

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

vbiydh.dll

Path \??\c:\brsaz\vbiydh.dll
Size 43KB
SHA256 0b747c32730f2ad29b44299054bc22f8075702b081e91edaaead528abca227d2
MD5 0164aeb78f4d2181e817a9a6b0ad22f1
SHA1 c56c6a743e48e8652707a34e4cddc1f645f140ea
SHA512 e69ad90790d8062a903954f7ea85cacd241113afaf0eb16098f473835cffcda6e1f9fa9844a8618cc297fffa2e6ff7d458f9ebb2ce3febf7ffd683ffd6ad44f5
SSDEEP 768:2DdBa8mqIOiSUZrBGhvQLq6UYiaKRsRMwwY2BjkTrXW/VJZ581swUqHhiQREQoJs:kwqnPUb+v0q6UY+sRMwwY2Jkal+1ZUqJ
TLSH
T19613F133EACCDFDFF8A05271C576D0FCD337AC2849669A0395A0219D9D60948B878F66
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

gvbos.exe

Path \??\c:\gvbos.exe
Size 87KB
SHA256 e126792a42779a5402813e8250af708426a0860da8911c53abfbcd5e748c0111
MD5 f51d888088fe964fca02256670aeb611
SHA1 0177c17671fe310d813fa152559f1c4f48843e31
SHA512 ad3c160587ec86d4abd4ec886fe305cbdd5f815c0f8c07772259aaf33efb9adf38a62cffaf85f5c308030ea849240e56f3aa98c71b24fa16071782ab1fc095ee
SSDEEP 1536:m/14ZaKO/myxZmAijMcCwVVydoM1bKAQAH9M53e+iWtnSdL:a14ZaKOTZSMcJVgDKxAH9MhtfSdL
TLSH
T13293CF232FBB4175DD44AF711E6B2665E6F2BD36212082768B5CAE8DA93CF44DB0131C
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4680-9-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4680-10-0x0000000000750000-0x0000000000752000-memory.dmp

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memory/4680-11-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4680-13-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4680-14-0x0000000010000000-0x0000000010021000-memory.dmp

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memory/4748-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4748-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5072-6-0x0000000000400000-0x0000000000417000-memory.dmp

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