farfli | f18fd7af32e9118e95cb79ba009b158dce0326756174324a7764a58a74e13107

Analysis

max time kernel
149s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
31/08/2026, 20:25

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General

Target
2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe
Size 273KB
Sample260831-y7c97seq5x
SHA256 f18fd7af32e9118e95cb79ba009b158dce0326756174324a7764a58a74e13107
MD5 4f6293d08c32266d47a602055f3c12ab
SHA1 36b9c27ac021a654589eb26815153de53f0f9265
SHA512 847c05139f72ee9c33e56802a68217bff94d7b05bc016017a22682a29e762c5f71c69b91a5f2da04dfdb0eba9262e250060c2f100d2d802f5d557b9299c494ac
SSDEEP 6144:H8AbwMmJOyOK5ZV7NHPR519jtr5a8MueZG7HZ:PwVJOp8FNprdrMul75
TLSH
T10C54CE11F621C945E4724C3177AE59388764FC19EB4CA643E3F86B0FDC2EE92A93C256
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 3 IoCs

resource	yara_rule
behavioral1/memory/1540-11-0x0000000010000000-0x000000001003D000-memory.dmp	family_farfli
behavioral1/memory/1540-13-0x0000000010000000-0x000000001003D000-memory.dmp	family_farfli
behavioral1/memory/1540-16-0x0000000010000000-0x000000001003D000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral1/memory/1540-11-0x0000000010000000-0x000000001003D000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1540-13-0x0000000010000000-0x000000001003D000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1540-16-0x0000000010000000-0x000000001003D000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 6 IoCs

resource	yara_rule
behavioral1/memory/3432-7-0x0000000000400000-0x000000000043A000-memory.dmp	UPX
behavioral1/files/0x000800000002454a-8.dat	UPX
behavioral1/memory/1540-10-0x0000000010000000-0x000000001003D000-memory.dmp	UPX
behavioral1/memory/1540-11-0x0000000010000000-0x000000001003D000-memory.dmp	UPX
behavioral1/memory/1540-13-0x0000000010000000-0x000000001003D000-memory.dmp	UPX
behavioral1/memory/1540-16-0x0000000010000000-0x000000001003D000-memory.dmp	UPX

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
17	1540	rundll32.exe
36	1540	rundll32.exe
37	1540	rundll32.exe
54	1540	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3432	vfbdn.exe

Executes dropped EXE 1 IoCs

pid	Process
3432	vfbdn.exe

Loads dropped DLL 1 IoCs

pid	Process
1540	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-1-5-21-1788976790-1541110888-1636651838-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\dfxhr\\zuucn.ucz\",RAFlush"	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)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	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 5 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000800000002454a-8.dat	upx
behavioral1/memory/1540-10-0x0000000010000000-0x000000001003D000-memory.dmp	upx
behavioral1/memory/1540-11-0x0000000010000000-0x000000001003D000-memory.dmp	upx
behavioral1/memory/1540-13-0x0000000010000000-0x000000001003D000-memory.dmp	upx
behavioral1/memory/1540-16-0x0000000010000000-0x000000001003D000-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
1064	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vfbdn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
1064	cmd.exe
4816	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
4816	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe
1540	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1540	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3644	2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe
3432	vfbdn.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3644 wrote to memory of 1064	3644	2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe	84
PID 1064 wrote to memory of 4816	1064	cmd.exe	86
PID 1064 wrote to memory of 3432	1064	cmd.exe	87
PID 3432 wrote to memory of 1540	3432	vfbdn.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3644
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\vfbdn.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-31_4f6293d08c32266d47a602055f3c12ab_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:1064
- - 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:4816
- - C:\Users\Admin\AppData\Local\Temp\vfbdn.exe
    C:\Users\Admin\AppData\Local\Temp\\vfbdn.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-31_4f6293d08c32266d47a602055f3c12ab_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3432
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\dfxhr\zuucn.ucz",RAFlush C:\Users\Admin\AppData\Local\Temp\vfbdn.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:1540

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

vfbdn.exe

Path C:\Users\Admin\AppData\Local\Temp\vfbdn.exe
Size 273KB
SHA256 bdd3005551d021a81007c5202a3c2a2e5c8f6cb0b83e58b5e42d543db867ba43
MD5 08729e1448a8a893ee54c7e1efc0f0c7
SHA1 5b1596bbd930073956d13ab83ab775a311daefa2
SHA512 6f324c7a1ef183228ebb5db5d72eac425a30f25021aa3fe974c11c12647541cd6916f5a280bbe9c8980445e6a19ffd870c7e61955ac3b7234b0c31cef2899dbd
SSDEEP 6144:H8AbwMmJOyOK5ZV7NHPR519jtr5a8MueZG7HS:PwVJOp8FNprdrMul7y
TLSH
T1B854CF11F621C945E4724C3177AE59388764FC19EB4CA643E3F86B0FDC2EE92A93C256
MD5 SHA1 SHA512 SSDEEP TLSH

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zuucn.ucz

Path \??\c:\dfxhr\zuucn.ucz
Size 81KB
SHA256 2973a0957bd204e123307415bade58f84cdf272c659048a99bf42dfdb563415a
MD5 fe3b1b222244f783fe9927ff16813c45
SHA1 69c88427b6fe1b75b4f5dc51d7dcce1bc438de9b
SHA512 ad16236d7b0bca4f021d031c8c75c5a339218f6e27dd8be62dfc3719cf945ba832ec6c4c04483622431ed545125415ca03a636a22b2d4f13cc9545fffbe7bd64
SSDEEP 1536:gz2wGkhJuwe4428NPz+Sczth8kgodmbxLhevko1pLHKDwJ:gzzTw4kN7TEtmbFhebJKsJ
TLSH
T1D783AD8AEB9E4B3EE84D4633AD929D31DC27FB5526588F7A43FC102CEE46752B200107
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1540-10-0x0000000010000000-0x000000001003D000-memory.dmp

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memory/1540-11-0x0000000010000000-0x000000001003D000-memory.dmp

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memory/1540-13-0x0000000010000000-0x000000001003D000-memory.dmp

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memory/1540-16-0x0000000010000000-0x000000001003D000-memory.dmp

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memory/3432-7-0x0000000000400000-0x000000000043A000-memory.dmp

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memory/3644-0-0x0000000000400000-0x000000000043A000-memory.dmp

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memory/3644-2-0x0000000000400000-0x000000000043A000-memory.dmp

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