farfli | 690da55eb5bb5134e355016a140258744f0b594524f72099c68d3b0573a0b025

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
09/05/2026, 07:02

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General

Target
2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe
Size 102KB
Sample260509-httf9sfv2n
SHA256 690da55eb5bb5134e355016a140258744f0b594524f72099c68d3b0573a0b025
MD5 e278177c997db860556a10202bf118f1
SHA1 5e8ca93f837be87ee86ed2aaf3ce60fc3ae4d5f0
SHA512 732b3af225e0d582891fb6a1e71a719a12e1339a002a58250fbf74820bb9739d4a4211de7cc047e51bcedda46c20a0ecfb4ddf20c1c094adf1751a6c3461033b
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T196A39D42ABF087A1E0619DB506735B629E73FC2B193482677BD6B70EAC34F40EE21355
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/3412-13-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/3412-13-0x0000000010000000-0x000000001002E000-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	3412	rundll32.exe
3	3412	rundll32.exe
2	3412	rundll32.exe
4	3412	rundll32.exe
5	3412	rundll32.exe
6	3412	rundll32.exe
7	3412	rundll32.exe
8	3412	rundll32.exe
9	3412	rundll32.exe
10	3412	rundll32.exe
13	3412	rundll32.exe
14	3412	rundll32.exe
15	3412	rundll32.exe
16	3412	rundll32.exe
17	3412	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4436	efafs.exe

Executes dropped EXE 1 IoCs

pid	Process
4436	efafs.exe

Loads dropped DLL 1 IoCs

pid	Process
3412	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-1-5-21-600123060-2148212387-2211176695-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\kgeev\\fyjencdqh.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)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	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)	\??\v:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	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

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	2026-05-09_e278177c997db860556a10202bf118f1_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	efafs.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
3096	cmd.exe
1756	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
1756	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3412	rundll32.exe
3412	rundll32.exe
3412	rundll32.exe
3412	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3412	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
6072	2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe
4436	efafs.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 6072 wrote to memory of 3096	6072	2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe	79
PID 3096 wrote to memory of 1756	3096	cmd.exe	81
PID 3096 wrote to memory of 4436	3096	cmd.exe	82
PID 4436 wrote to memory of 3412	4436	efafs.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:6072
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\efafs.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3096
- - 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:1756
- - \??\c:\efafs.exe
    c:\efafs.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-09_e278177c997db860556a10202bf118f1_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4436
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\kgeev\fyjencdqh.dll",GetWindowClass c:\efafs.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:3412

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

efafs.exe

Path C:\efafs.exe
Size 102KB
SHA256 427bbe62c362b4946220b1494f8fb8d4cb0cb72e34e81cd22e683eeb172476c9
MD5 4009e3e35a005f04f70f03b663d57320
SHA1 cec8e7ea8eb7abc9316f72e17a7ca1e6e6b98ca2
SHA512 486b7893af26100ee2b429e7b325c2cafb1baf1deb5cbf37ac5509e5c68cf54f1f55f61622a11a98cf21d64e38a6949f61d4768475dc09c060d304f3ff5114fd
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48c:piAXaKDeKNnD36cb8tI8c
TLSH
T12AA3AE42ABF087A1E0619DB506735B629E73FC2B193482277BD6B70EAC34F40EE25355
MD5 SHA1 SHA512 SSDEEP TLSH

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fyjencdqh.dll

Path \??\c:\kgeev\fyjencdqh.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

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memory/3412-11-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/3412-13-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/3412-12-0x00000000027A0000-0x0000000002A2B000-memory.dmp

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memory/3412-20-0x00000000027A0000-0x0000000002A2B000-memory.dmp

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memory/3412-26-0x00000000027A0000-0x0000000002A2B000-memory.dmp

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memory/4436-8-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/6072-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/6072-3-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/6072-2-0x0000000000CD0000-0x0000000000F5B000-memory.dmp

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