farfli | f8a0ca375ab26841d8be1f2f09258c4096efb636290a539cd46a8a9e88e3d178

Analysis

max time kernel
149s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
26/04/2026, 04:29

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General

Target
2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe
Size 152KB
Sample260426-e4dxsadt7t
SHA256 f8a0ca375ab26841d8be1f2f09258c4096efb636290a539cd46a8a9e88e3d178
MD5 81fb670d7fc07308a6c9a144e65b0d7a
SHA1 5947c5a82b93c9bbb81d064a7b2876041c92975c
SHA512 971b5d7e0f8ae3e2378af4db8a15bddc0bf923b2944c40c1df5323a2a7e97d96e44d91f3294b301be7de154ffc10c668864e6b4bff24e1b59c15af2f55599ae3
SSDEEP 3072:mK4RNx65b4RoIwZpx10ZENfrGSQ7sDU/ySkNAq:ml65xiZuKoDkySkNA
TLSH
T1B8E3D0CE1F7ACFDBE1202C75D1A416F742529C99EB2457978385FD8EB832C81AC36126
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 2 IoCs

resource	yara_rule
behavioral2/memory/4324-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4324-13-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4324-12-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4324-13-0x0000000010000000-0x000000001002E000-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
2	4324	rundll32.exe
3	4324	rundll32.exe
4	4324	rundll32.exe
5	4324	rundll32.exe
6	4324	rundll32.exe
7	4324	rundll32.exe
9	4324	rundll32.exe
11	4324	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1416	vtejw.exe

Executes dropped EXE 1 IoCs

pid	Process
1416	vtejw.exe

Loads dropped DLL 1 IoCs

pid	Process
4324	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-1-5-21-2122505878-652277452-2375749442-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\fhmhj\\pjyhz.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)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
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)	\??\g:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\s:	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	vtejw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_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

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
2968	cmd.exe
4148	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
4148	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4324	rundll32.exe
4324	rundll32.exe
4324	rundll32.exe
4324	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4324	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3432	2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe
1416	vtejw.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3432 wrote to memory of 2968	3432	2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe	80
PID 2968 wrote to memory of 4148	2968	cmd.exe	82
PID 2968 wrote to memory of 1416	2968	cmd.exe	83
PID 1416 wrote to memory of 4324	1416	vtejw.exe	84

C:\Users\Admin\AppData\Local\Temp\2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3432
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\vtejw.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2968
- - 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:4148
- - \??\c:\vtejw.exe
    c:\vtejw.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-26_81fb670d7fc07308a6c9a144e65b0d7a_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1416
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\fhmhj\pjyhz.dll",init c:\vtejw.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:4324

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

vtejw.exe

Path C:\vtejw.exe
Size 152KB
SHA256 fa71203ec4bd61e7ac95c8228b5540b145be497a2501cd0325f559cafd43bfc1
MD5 a62a2e25d454459c643b376d89bdaa38
SHA1 42c516923416fa8795099712d4592211e0b3881c
SHA512 e1545321d87fb85469015c5f43feb432f31cca75e9ea7f825eeb424c939f6216cdc5cf796ceb20e5e58d3d6946a32345ca239f011419188d82e76aa335cacbe9
SSDEEP 3072:mK4RNx65b4RoIwZpx10ZENfrGSQ7sDU/ySkNAqw:ml65xiZuKoDkySkNA7
TLSH
T1ADE3D0CE1F7ACFDBE1202C74D1A416F742529C99EB2457978385FD8EB832D81AC36126
MD5 SHA1 SHA512 SSDEEP TLSH

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pjyhz.dll

Path \??\c:\fhmhj\pjyhz.dll
Size 42KB
SHA256 c7c41689de030df0f78f471422fa2a6383b36e77c94e7f6f124a96feb3e27ed7
MD5 36e3fb5964d663272cf1169e1e1ca478
SHA1 58115e08b49505bcbbb5c88a28a86222ba18d5d4
SHA512 daff53b11aa400437a06287707a334a09661c1ef7d0fd8beaf1a874c79c16fe45bd1188343d0623e839d3ead5ea2dd90896e37ccf3b252c7220c74989a9ba442
SSDEEP 768:t0inj1jJ5OeUMhBNSqHvMjjAipMkuG30sv2xEZkWldADAKPIp:t0ipV5uMhBt0jjAiusv22ZkWTOAKP8
TLSH
T1D813E19B6BEC7029FDD22BB4F4F66815EEB63F388CB2C70E114941AB1C3A9D51251706
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1416-7-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/3432-0-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/3432-2-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/4324-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4324-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4324-11-0x00000000008E0000-0x00000000008E1000-memory.dmp

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memory/4324-13-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4324-14-0x00000000008E0000-0x00000000008E1000-memory.dmp

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