farfli | 7643d0f339c9f016140e47c5cdc5e20550349e60a03ebed34778f7d40a2441c1

Analysis

max time kernel
148s
max time network
148s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
24/10/2026, 22:23

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General

Target
2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_elex_wannacry.exe
Size 154KB
Sample261024-2a7pbsev8n
SHA256 7643d0f339c9f016140e47c5cdc5e20550349e60a03ebed34778f7d40a2441c1
MD5 0962209d6045e5ebcff6cbc1d5c2bb08
SHA1 bf09d7a56ba2ba232ea5e10d25f20242e56554d4
SHA512 4e8e0f23977dd5d9fad8cf4d9b05374c3f1c004b2292621b5e230aa8ecd7ae3fbdf3aca72efa7de97a1d00d35cecb5fa61660ab7981059d52b7d737aa88ac008
SSDEEP 3072:mK4RNx65b4RoIwZpx10ZENfrGSQ7sDU/ySkNAq:ml65xiZuKoDkySkNA
TLSH
T13EF3D0CE1F7ACFDBE1202C74D1A416F742529C99EB2547978385FD8EB432D819C3612A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion 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/4160-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4160-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4160-10-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4160-12-0x0000000010000000-0x000000001002E000-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
7	4160	rundll32.exe
8	4160	rundll32.exe
10	4160	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
2660	wzvlm.exe

Executes dropped EXE 1 IoCs

pid	Process
2660	wzvlm.exe

Loads dropped DLL 1 IoCs

pid	Process
4160	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-1-5-21-461973139-3212354679-1508698038-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\cabbp\\ykhiswj.dll\",init"	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)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	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
4756	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	rundll32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	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	2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_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	wzvlm.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
4756	cmd.exe
2540	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
2540	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4160	rundll32.exe
4160	rundll32.exe
4160	rundll32.exe
4160	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4160	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1592	2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_elex_wannacry.exe
2660	wzvlm.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1592 wrote to memory of 4756	1592	2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_elex_wannacry.exe	89
PID 4756 wrote to memory of 2540	4756	cmd.exe	91
PID 4756 wrote to memory of 2660	4756	cmd.exe	92
PID 2660 wrote to memory of 4160	2660	wzvlm.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1592
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\wzvlm.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_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:4756
- - 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:2540
- - \??\c:\wzvlm.exe
    c:\wzvlm.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-22_0962209d6045e5ebcff6cbc1d5c2bb08_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2660
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\cabbp\ykhiswj.dll",init c:\wzvlm.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)
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4160

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

Indicator Removal

T1070

File Deletion

T1070.004

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

ykhiswj.dll

Path \??\c:\cabbp\ykhiswj.dll
Size 42KB
SHA256 c7c41689de030df0f78f471422fa2a6383b36e77c94e7f6f124a96feb3e27ed7
MD5 36e3fb5964d663272cf1169e1e1ca478
SHA1 58115e08b49505bcbbb5c88a28a86222ba18d5d4
SHA512 daff53b11aa400437a06287707a334a09661c1ef7d0fd8beaf1a874c79c16fe45bd1188343d0623e839d3ead5ea2dd90896e37ccf3b252c7220c74989a9ba442
SSDEEP 768:t0inj1jJ5OeUMhBNSqHvMjjAipMkuG30sv2xEZkWldADAKPIp:t0ipV5uMhBt0jjAiusv22ZkWTOAKP8
TLSH
T1D813E19B6BEC7029FDD22BB4F4F66815EEB63F388CB2C70E114941AB1C3A9D51251706
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

wzvlm.exe

Path \??\c:\wzvlm.exe
Size 154KB
SHA256 57fb3a4858100deda9cb73aa1279099747a6c9270c4f93b88b169928a7517ff6
MD5 7c4f8b9afdc90efc5a21dd743fbf41cc
SHA1 3f504b700558b411616df99fe01db4b9ee205d8a
SHA512 aa708136f9c3d510d06746026446f2871a1ef34cdfc582e09feef31366e3242aa6aa80b92844ad3b33d65d8ea8a6474c33265b81805a3983be902ad52b258e92
SSDEEP 3072:mK4RNx65b4RoIwZpx10ZENfrGSQ7sDU/ySkNAqj:ml65xiZuKoDkySkNAm
TLSH
T1AFF3D0CE1F7ACFDBE1202C74D1A416F742529C99EB2547A78385FD8EB832D819C36129
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1592-0-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/1592-2-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/2660-6-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/4160-9-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4160-11-0x0000000000DF0000-0x0000000000DF1000-memory.dmp

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memory/4160-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4160-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4160-13-0x0000000000DF0000-0x0000000000DF1000-memory.dmp

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