farfli | b9b1905e68d084cf7dcede1e0655e8a864e47207482f9fb24a41f47618e32ce2

Analysis

max time kernel
148s
max time network
147s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
10/08/2026, 04:30

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General

Target
2026-08-10_88253d8157d663c07232ee5b033e6c00_elex_wannacry.exe
Size 98KB
Sample260810-e4zjgsea94
SHA256 b9b1905e68d084cf7dcede1e0655e8a864e47207482f9fb24a41f47618e32ce2
MD5 88253d8157d663c07232ee5b033e6c00
SHA1 b10ad08b3a1a431d60f6e375a9985b4736ff1b1f
SHA512 21eb774ef897af31cb49c347beaf1d2ff3ff4e61fc86f33f3bea55e10ec069825e39b20b9f37e8cc05581ab681e6b03b3199ece297480de5fdc41cd6bb22d244
SSDEEP 1536:agDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIczB:ELRrO10TiJD9yjqrilyxOGB
TLSH
T17DA3CF5C7C87885EE5048B7047539626B6726C59FA304F378340BA2EBB37907DEE928D
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 3 IoCs

resource	yara_rule
behavioral2/memory/4536-11-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/4536-14-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/4536-15-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4536-11-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4536-14-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4536-15-0x0000000010000000-0x0000000010023000-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
5	4536	rundll32.exe
6	4536	rundll32.exe
7	4536	rundll32.exe
13	4536	rundll32.exe
14	4536	rundll32.exe
15	4536	rundll32.exe
17	4536	rundll32.exe
19	4536	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3872	txrxm.exe

Executes dropped EXE 1 IoCs

pid	Process
3872	txrxm.exe

Loads dropped DLL 1 IoCs

pid	Process
4536	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-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\xhfefqh\\udfbo.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)	\??\q:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\m:	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)	\??\w:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	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)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\p:	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
2572	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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_88253d8157d663c07232ee5b033e6c00_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	txrxm.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
2572	cmd.exe
4232	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
4232	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4536	rundll32.exe
4536	rundll32.exe
4536	rundll32.exe
4536	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4536	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4220	2026-08-10_88253d8157d663c07232ee5b033e6c00_elex_wannacry.exe
3872	txrxm.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4220 wrote to memory of 2572	4220	2026-08-10_88253d8157d663c07232ee5b033e6c00_elex_wannacry.exe	88
PID 2572 wrote to memory of 4232	2572	cmd.exe	91
PID 2572 wrote to memory of 3872	2572	cmd.exe	92
PID 3872 wrote to memory of 4536	3872	txrxm.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-10_88253d8157d663c07232ee5b033e6c00_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_88253d8157d663c07232ee5b033e6c00_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4220
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\txrxm.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-10_88253d8157d663c07232ee5b033e6c00_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:2572
- - 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:4232
- - C:\Users\Admin\AppData\Local\Temp\txrxm.exe
    C:\Users\Admin\AppData\Local\Temp\\txrxm.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-10_88253d8157d663c07232ee5b033e6c00_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3872
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\xhfefqh\udfbo.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\txrxm.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:4536

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

txrxm.exe

Path C:\Users\Admin\AppData\Local\Temp\txrxm.exe
Size 98KB
SHA256 7c1cd6a6518173450271c71dda9a74b8c6c15922fbadbab25a4d22d6990d4c88
MD5 1d93f906e0c5c20c72932fffb08c56fc
SHA1 20bf7e34abad955ad5b722d10280889b61ba94b0
SHA512 9d09525ce8eebe67de8250f490a3cbda29c8ac514868bfc02e306d85364010753f9d940943e51b34e9110a14df47b3f6541eca23103b5838d9dd15e4c1d70a44
SSDEEP 1536:agDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIczm:ELRrO10TiJD9yjqrilyxOGm
TLSH
T183A3BF1D7C87885EE5048B7047539626B6726C59FA304F378340BA1EBB37907EEE928D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

udfbo.dll

Path \??\c:\xhfefqh\udfbo.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/3872-6-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4220-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4220-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4536-9-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4536-10-0x00000000013B0000-0x00000000013B2000-memory.dmp

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memory/4536-11-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4536-12-0x00000000013B0000-0x00000000013B2000-memory.dmp

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memory/4536-14-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4536-15-0x0000000010000000-0x0000000010023000-memory.dmp

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