farfli | 9180d3bad51a59506620673e3013f7d4a863fcb9d04017ccccd038f2b368c3d3

General

Target
2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe
Size 102KB
Sample260505-esdsmscs2p
SHA256 9180d3bad51a59506620673e3013f7d4a863fcb9d04017ccccd038f2b368c3d3
MD5 aef13bac68cdb0d8314e88f4f718b244
SHA1 2ff6164cbf0d196c3d458777fcf23ac310b7f51d
SHA512 bc11fd9146a1d5fb0ff876e7ce212a656feef5ec3632002ea6fe8ef5f24f933a97ef7c62e2a9989d971420fa4316d57f0d7b9a6f81c5f3c564a7a783ec83c44e
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T12CA39D42ABF08661E0619DB506735B629EB3FC2B193483677BD6B70EAC34F40EE21355
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/4720-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/4720-12-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 15 IoCs

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

flow	pid	Process
1	4720	rundll32.exe
3	4720	rundll32.exe
2	4720	rundll32.exe
4	4720	rundll32.exe
5	4720	rundll32.exe
6	4720	rundll32.exe
7	4720	rundll32.exe
8	4720	rundll32.exe
9	4720	rundll32.exe
10	4720	rundll32.exe
13	4720	rundll32.exe
14	4720	rundll32.exe
15	4720	rundll32.exe
16	4720	rundll32.exe
17	4720	rundll32.exe

Deletes itself 1 IoCs

pid	Process
5360	vrcdf.exe

Executes dropped EXE 1 IoCs

pid	Process
5360	vrcdf.exe

Loads dropped DLL 1 IoCs

pid	Process
4720	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:\\xexdd\\ullbvxpzk.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)	\??\l:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\j:	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	2026-05-05_aef13bac68cdb0d8314e88f4f718b244_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	vrcdf.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
5072	cmd.exe
4992	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
4992	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4720	rundll32.exe
4720	rundll32.exe
4720	rundll32.exe
4720	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4720	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4940	2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe
5360	vrcdf.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4940 wrote to memory of 5072	4940	2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe	79
PID 5072 wrote to memory of 4992	5072	cmd.exe	81
PID 5072 wrote to memory of 5360	5072	cmd.exe	82
PID 5360 wrote to memory of 4720	5360	vrcdf.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4940
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\vrcdf.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:5072
- - 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:4992
- - \??\c:\vrcdf.exe
    c:\vrcdf.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-05_aef13bac68cdb0d8314e88f4f718b244_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5360
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\xexdd\ullbvxpzk.dll",GetWindowClass c:\vrcdf.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:4720

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

vrcdf.exe

Path C:\vrcdf.exe
Size 102KB
SHA256 cfed60c54b395a921ba00c275d2269aaf7399772602c4cafee2760bb2a76d35c
MD5 be1cc9feaee0189512f5c2c25e35413b
SHA1 c68649aff6e2721e3fc451e6c2cfd2b0f6c58015
SHA512 4f54838b36f67e9b6d5c2cffd6ff6ed2ea315c2b5bfc08156a08b979d13f025675b408b4a7704934939272f17cfe5289a52f7974d06b6432b72edc7e693a1cb6
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48P:piAXaKDeKNnD36cb8tI8P
TLSH
T13FA39D42ABF08761E0659DB506735B629EB2FC2B193483277BD6B70EAC34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

ullbvxpzk.dll

Path \??\c:\xexdd\ullbvxpzk.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/4720-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4720-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4720-11-0x0000000000A20000-0x0000000000A6A000-memory.dmp

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memory/4940-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/4940-2-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/5360-7-0x0000000000400000-0x000000000041A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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