farfli | d7263c702a07fb66486d0cd5346cbe185e3231635a721cae8523de66ddc28eac

Analysis

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

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
19/08/2026, 08:29

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General

Target
2026-08-19_4f87a702ae22453d60f666d93c8e5e58_elex_wannacry.exe
Size 96KB
Sample260819-kdts7sstdz
SHA256 d7263c702a07fb66486d0cd5346cbe185e3231635a721cae8523de66ddc28eac
MD5 4f87a702ae22453d60f666d93c8e5e58
SHA1 3b88496cbb6d1ca222408a946c334cccaf070335
SHA512 0bbb251decbe6a3ffc5952690d632078395cbad47d611aa9d4b7826a3ab977094715b5ed35a4a4f5038ca31810215dda8d9d1a35fd72ea801ecc6ad5db78d098
SSDEEP 1536:8gDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIckWlmyp6:uLRrO10TiJD9yjqrilyxOuPp6
TLSH
T16BA3BF5DAE5388AED0014B3147579715E6B2AC19F9714F334350FA1DEF3290BEEDA288
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/3248-11-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/3248-13-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/3248-14-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/3248-11-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3248-13-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/3248-14-0x0000000010000000-0x0000000010023000-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
3	3248	rundll32.exe
4	3248	rundll32.exe
5	3248	rundll32.exe
11	3248	rundll32.exe
12	3248	rundll32.exe
14	3248	rundll32.exe
15	3248	rundll32.exe
16	3248	rundll32.exe

Deletes itself 1 IoCs

pid	Process
5836	trwxw.exe

Executes dropped EXE 1 IoCs

pid	Process
5836	trwxw.exe

Loads dropped DLL 1 IoCs

pid	Process
3248	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:\\frcwg\\ecfoj.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)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	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

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
5800	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	2026-08-19_4f87a702ae22453d60f666d93c8e5e58_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	trwxw.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
5800	cmd.exe
5340	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
5340	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3248	rundll32.exe
3248	rundll32.exe
3248	rundll32.exe
3248	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3248	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4684	2026-08-19_4f87a702ae22453d60f666d93c8e5e58_elex_wannacry.exe
5836	trwxw.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 5800	4684	2026-08-19_4f87a702ae22453d60f666d93c8e5e58_elex_wannacry.exe	89
PID 5800 wrote to memory of 5340	5800	cmd.exe	91
PID 5800 wrote to memory of 5836	5800	cmd.exe	92
PID 5836 wrote to memory of 3248	5836	trwxw.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-19_4f87a702ae22453d60f666d93c8e5e58_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_4f87a702ae22453d60f666d93c8e5e58_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4684
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\trwxw.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-19_4f87a702ae22453d60f666d93c8e5e58_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:5800
- - 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:5340
- - C:\Users\Admin\AppData\Local\Temp\trwxw.exe
    C:\Users\Admin\AppData\Local\Temp\\trwxw.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-19_4f87a702ae22453d60f666d93c8e5e58_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5836
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\frcwg\ecfoj.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\trwxw.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:3248

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

trwxw.exe

Path C:\Users\Admin\AppData\Local\Temp\trwxw.exe
Size 97KB
SHA256 fb3b3ac24f1ed8661709bc1d3b2fc92767d2528db0f6eb65c748baa87eb65344
MD5 d3e7b24edfe85faa80424b9bb6abdeb0
SHA1 c504c553b1d60b3a6a9360d97e4c0e96f2a4cba0
SHA512 972105190cdc716c2242bf5d978659ea4afbb53397c0ae0d6f8e9972b3e6906335525d3e96eaedbf5988343bb14591b173f6ebd17305e168dd46821dddc57aa6
SSDEEP 1536:8gDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIckWlmyp67:uLRrO10TiJD9yjqrilyxOuPp67
TLSH
T1DEA3BF1DAE5389AEE0014B7147579715E6B2AC19F9704F334350FA1DEF3290BEEDA288
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

ecfoj.dll

Path \??\c:\frcwg\ecfoj.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/3248-9-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/3248-10-0x0000000002070000-0x0000000002072000-memory.dmp

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memory/3248-11-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/3248-13-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/3248-14-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/4684-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4684-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5836-6-0x0000000000400000-0x0000000000417000-memory.dmp

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