farfli | b970cef07260b8fb68b6a1ade17ec7d22f64a7a1e2cd02a9d2d933b0e8f9680d

Analysis

max time kernel
150s
max time network
152s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
10/09/2026, 00:24

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General

Target
2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_elex_wannacry.exe
Size 97KB
Sample260910-aqdmmsvwew
SHA256 b970cef07260b8fb68b6a1ade17ec7d22f64a7a1e2cd02a9d2d933b0e8f9680d
MD5 0d3b356bf5f0c4502041fd39f65a0a55
SHA1 59c5c33f1d1a0fb27b7af3b1dcf29f88f9c7afd0
SHA512 757d747bfbda98c8aad5f98cebbebe234260baa9c57270442b0c6091b38a3b039cede9088eeeb4bf467ac43735e8a37943dce403a1c1b3198167078d3e9a0ff8
SSDEEP 1536:8gDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIckWlmyp68:uLRrO10TiJD9yjqrilyxOuPp68
TLSH
T1D7A3BF1DAE53886EE0014B3147579715E6B2AC5AF9714F334350FA1DAF3290BEEDA288
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 2 IoCs

resource	yara_rule
behavioral2/memory/5564-11-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/5564-15-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/5564-11-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5564-15-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 3 IoCs

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

flow	pid	Process
8	5564	rundll32.exe
9	5564	rundll32.exe
11	5564	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3552	kmekc.exe

Executes dropped EXE 1 IoCs

pid	Process
3552	kmekc.exe

Loads dropped DLL 1 IoCs

pid	Process
5564	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:\\fsyxlvys\\oleuz.dll\",QueryPluginInterface"	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)	\??\h:	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)	\??\x:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\l:	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
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\w:	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
5416	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	2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_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	kmekc.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
5416	cmd.exe
4272	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
4272	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5564	rundll32.exe
5564	rundll32.exe
5564	rundll32.exe
5564	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5564	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2384	2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_elex_wannacry.exe
3552	kmekc.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 5416	2384	2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_elex_wannacry.exe	89
PID 5416 wrote to memory of 4272	5416	cmd.exe	91
PID 5416 wrote to memory of 3552	5416	cmd.exe	92
PID 3552 wrote to memory of 5564	3552	kmekc.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2384
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\kmekc.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_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:5416
- - 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:4272
- - C:\Users\Admin\AppData\Local\Temp\kmekc.exe
    C:\Users\Admin\AppData\Local\Temp\\kmekc.exe "C:\Users\Admin\AppData\Local\Temp\2026-09-09_0d3b356bf5f0c4502041fd39f65a0a55_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3552
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\fsyxlvys\oleuz.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\kmekc.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:5564

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

kmekc.exe

Path C:\Users\Admin\AppData\Local\Temp\kmekc.exe
Size 97KB
SHA256 31a0bcdfa98411513c7bdfaf42e2762c2b8405132ec9f7b5f66fb4e2ef3dcf86
MD5 bce21b896a925d36502f637decd5ffe9
SHA1 ba6339163937c0d93d38572954eb59ed169c1d71
SHA512 f8427f01a132542fb7f74ceadafd9ac8da0092db2e2418083e35a3283ab9d5ef588292c7896d0c2595e74b737d060bf5e1304ed03c11cd0f53ac023e90eb7ef7
SSDEEP 1536:8gDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIckWlmyp66:uLRrO10TiJD9yjqrilyxOuPp66
TLSH
T1E4A3BF1DAD5389AEE0014B7143579715E6B2AC19F9714F334350FA1DAF32A0BEED9288
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

oleuz.dll

Path \??\c:\fsyxlvys\oleuz.dll
Size 44KB
SHA256 9111c1eb1f0b59dcd49cfd5a0abc0ba100ac59a3bcae8623ff091dfdc46fed3c
MD5 0f12a7d509b2c9bb9b4cd6d8a0325e86
SHA1 f5fb59ad4f0633d115b06f35a2dc161dc4367157
SHA512 e3c84a643ff0a2627daba8a056221985a472aaf07bade61b3e9459db4bfc8792c1347606911e3fcc01581508004b18b5435bcccd5e7617cc6d091f37a5f42e7f
SSDEEP 768:DICzePjle2367kjhrXLdCuYMW8QVnwrLDGe/brbtJyOTuXfADVjeJ2i/MVJWAE:DDePjA23Ukjh37YMonwrvGybrbbRCf4E
TLSH
T1FD23F1A7B94E8D4FC0AE41F7078FC8D422B5589A97A7CB4626008F216CC4FB07E52376
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2384-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2384-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3552-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5564-9-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/5564-10-0x00000000007D0000-0x00000000007D2000-memory.dmp

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memory/5564-11-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/5564-12-0x00000000007D0000-0x00000000007D2000-memory.dmp

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memory/5564-15-0x0000000010000000-0x0000000010023000-memory.dmp

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