farfli | 03a888f804ffd3a06cb8f332e8fb2a092a21cb102794b4079f51412a80e267f6

Analysis

max time kernel
148s
max time network
138s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
03/08/2026, 11:17

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General

Target
2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.exe
Size 119KB
Sample260803-nd46qagf32
SHA256 03a888f804ffd3a06cb8f332e8fb2a092a21cb102794b4079f51412a80e267f6
MD5 a8ad6c13d5b313c204dde7849ce01dee
SHA1 ea31ba74686e7ee73550b3efced313d23b22e040
SHA512 0e370a9f128109538349c85588f4ed0cc54ca0604c93c9cdd3144ba80be0e03d4ac5bdca465ca4d4dfbf375c884b1daae6fe9e59e43bee82c8942a309efd049d
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdB:KiAXaKDXZa/4VlCm7fE7QlEKtSNid
TLSH
T1C9C39D126BF4C9A6E0661DB4177B47644A76FC6E3E1883175798A60EEC30F00EF293A4
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 4 IoCs

resource	yara_rule
behavioral2/memory/4204-9-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4204-10-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/4204-11-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4204-12-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4204-9-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4204-11-0x0000000010000000-0x000000001002E000-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
3	4204	rundll32.exe
6	4204	rundll32.exe
7	4204	rundll32.exe
8	4204	rundll32.exe
15	4204	rundll32.exe
16	4204	rundll32.exe
19	4204	rundll32.exe
21	4204	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4400	xrsqt.exe

Executes dropped EXE 1 IoCs

pid	Process
4400	xrsqt.exe

Loads dropped DLL 1 IoCs

pid	Process
4204	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-1-5-21-3611646547-550105268-947503007-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\czppgqos\\yvkcj.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)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\n:	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)	\??\b:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	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
2928	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xrsqt.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.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
2928	cmd.exe
5496	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
5496	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4204	rundll32.exe
4204	rundll32.exe
4204	rundll32.exe
4204	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4204	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5672	2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.exe
4400	xrsqt.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5672 wrote to memory of 2928	5672	2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.exe	90
PID 2928 wrote to memory of 5496	2928	cmd.exe	92
PID 2928 wrote to memory of 4400	2928	cmd.exe	93
PID 4400 wrote to memory of 4204	4400	xrsqt.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5672
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\xrsqt.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_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:2928
- - 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:5496
- - \??\c:\xrsqt.exe
    c:\xrsqt.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-03_a8ad6c13d5b313c204dde7849ce01dee_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4400
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\czppgqos\yvkcj.dll",GetWindowClass c:\xrsqt.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:4204

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

yvkcj.dll

Path \??\c:\czppgqos\yvkcj.dll
Size 46KB
SHA256 615e79da4fd5512e796a7aa7335791445c4419564a62065b96ec6af4f45c5da0
MD5 e1b69009b84a57990f394d671390ed02
SHA1 586cb5213c9cbdfe5ce94a284c324d917cc52903
SHA512 c78b9484fa33cf5379257ab965d56b229d696fe262367a180bf7b50691b0c51e5a07dc7b96be07cf977ea0aab9ce29c503c4f36c4009ec480e2fb0498ffc13bc
SSDEEP 768:KsUfnvxs6iLlhpfFPtnQf7kifD/v7yb9BEtoyviA1129Vvi3UTP:KsJT1qf4W/vub9yNiA118d+kP
TLSH
T17823F2A947B44EB3E2BD0779889187DC69BD6D26173384054A6301DF7C70443EA6C6EE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

xrsqt.exe

Path \??\c:\xrsqt.exe
Size 119KB
SHA256 000fdf2282cc73ba7dfd6b8d33edc725acbc940b83d9fd60bdd78227434b93dd
MD5 efd63cc2dab178e064bdecbe9cb6d865
SHA1 7c59ef474d94a4f400bedbb88bed51d35cce2e99
SHA512 3a7d2669d4dc49468da28a993104dc8b13d59d5e4d456850a3a9f0e6096882615fa1b4184cb23ff49d2427a5a724ad4ff2881a5f22b52e20b17e8abeb67e0fd7
SSDEEP 1536:cRiAXaKD5g4ZlYjqe2M4VlCmfvrr7EC6QucEqrtmA6AeSWt3SdB0:KiAXaKDXZa/4VlCm7fE7QlEKtSNidi
TLSH
T166C39D126BF4C9A6E0665DB4177B47644A76FC6E3E1883175798A70EEC30F00EF293A4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4204-9-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4204-10-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4204-11-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4204-12-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4400-6-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/5672-0-0x0000000000400000-0x000000000041B000-memory.dmp

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memory/5672-2-0x0000000000400000-0x000000000041B000-memory.dmp

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