farfli | 022c661569c352c53d41e007c55b6f244532e48b368154c2646a67e4bcafa133

Analysis

max time kernel
148s
max time network
137s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
05/11/2026, 05:05

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General

Target
2026-11-04_f53001dcc7ec198a1311cd793f24cf76_elex_wannacry.exe
Size 117KB
Sample261105-fq2mcsxtew
SHA256 022c661569c352c53d41e007c55b6f244532e48b368154c2646a67e4bcafa133
MD5 f53001dcc7ec198a1311cd793f24cf76
SHA1 fb272f5e34e39df0786ef438e3eb22ea945b7750
SHA512 232df3d70ceea5ad5d1fc62804066f61a7285b765cf4f2b965372d4707fa8fc5e953323a80ea921770637b0e74724698014ce86489b0376ae77c92a87c20a88f
SSDEEP 1536:N/14ZaKO/mHFqDMt8vdDMwgUmyZRTzeueKXOYDoAQLG7Y1iWtXoa7:Z14ZaKOytU//RXeu7OWoAQJpYa7
TLSH
T195C34A0327F981A5F0B63E73567B55204AB2BCD96D34CE1E4F54660E9970F20EE633A2
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 5 IoCs

resource	yara_rule
behavioral2/memory/4644-11-0x0000000010000000-0x0000000010020000-memory.dmp	family_farfli
behavioral2/memory/4644-13-0x0000000010000000-0x0000000010020000-memory.dmp	family_farfli
behavioral2/memory/4644-14-0x0000000010000000-0x0000000010020000-memory.dmp	family_farfli
behavioral2/memory/4644-15-0x0000000010000000-0x0000000010020000-memory.dmp	family_farfli
behavioral2/memory/4644-16-0x0000000010000000-0x0000000010020000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral2/memory/4644-11-0x0000000010000000-0x0000000010020000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4644-13-0x0000000010000000-0x0000000010020000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4644-14-0x0000000010000000-0x0000000010020000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4644-15-0x0000000010000000-0x0000000010020000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4644-16-0x0000000010000000-0x0000000010020000-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
8	4644	rundll32.exe
10	4644	rundll32.exe
12	4644	rundll32.exe
11	4644	rundll32.exe
13	4644	rundll32.exe
14	4644	rundll32.exe
16	4644	rundll32.exe
18	4644	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
2872	efpbqvmg.exe

Executes dropped EXE 1 IoCs

pid	Process
2872	efpbqvmg.exe

Loads dropped DLL 1 IoCs

pid	Process
4644	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-1-5-21-696679853-3915825385-3233721679-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\ogskz\\rocsd.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)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	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)	\??\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
5096	cmd.exe

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

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	2026-11-04_f53001dcc7ec198a1311cd793f24cf76_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	efpbqvmg.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
1724	PING.EXE
5096	cmd.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
1724	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4644	rundll32.exe
4644	rundll32.exe
4644	rundll32.exe
4644	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4644	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3480	2026-11-04_f53001dcc7ec198a1311cd793f24cf76_elex_wannacry.exe
2872	efpbqvmg.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3480 wrote to memory of 5096	3480	2026-11-04_f53001dcc7ec198a1311cd793f24cf76_elex_wannacry.exe	90
PID 5096 wrote to memory of 1724	5096	cmd.exe	92
PID 5096 wrote to memory of 2872	5096	cmd.exe	93
PID 2872 wrote to memory of 4644	2872	efpbqvmg.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-11-04_f53001dcc7ec198a1311cd793f24cf76_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-04_f53001dcc7ec198a1311cd793f24cf76_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3480
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\efpbqvmg.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-04_f53001dcc7ec198a1311cd793f24cf76_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:5096
- - 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:1724
- - \??\c:\efpbqvmg.exe
    c:\efpbqvmg.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-04_f53001dcc7ec198a1311cd793f24cf76_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2872
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\ogskz\rocsd.dll",GetWindowClass c:\efpbqvmg.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:4644

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

efpbqvmg.exe

Path \??\c:\efpbqvmg.exe
Size 117KB
SHA256 1780d4c931836a20e160ada219b465dd7e465fc3b02fa99e45acf9f0c883e9b7
MD5 8223b1f930ad4a62ffc5962861b7b435
SHA1 9e21663d001dd776391b7e38375d1946f97d8086
SHA512 47579d47ec940cde153bca36e535bae1b786038b3a8834b5722806c15a8fc2321c8f35298d4813d80371392224823ab54663c47706f29bfd340de0dfd55d0f20
SSDEEP 1536:N/14ZaKO/mHFqDMt8vdDMwgUmyZRTzeueKXOYDoAQLG7Y1iWtXoaU:Z14ZaKOytU//RXeu7OWoAQJpYaU
TLSH
T15CC33A0327F981A5F0B63E73567B55204AB2BCD96D34CE1E4F54660E9970F20EE633A2
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

rocsd.dll

Path \??\c:\ogskz\rocsd.dll
Size 42KB
SHA256 c667caef3521735f1179dbb8e175cc34aeccb3c4ca99a33b6439f5434ad13297
MD5 fbb8994174071ab6aeee5a03ff4146c0
SHA1 53778e5cf624302ebc20bacab571402aa10bd991
SHA512 3f83a6556c5bed000e02a47f01dacb08a50517fd20670fcbb06f0a3d3bb7ea6d1d5a6ad0132f21450f900a10f5c994fd7ee20f3a2caea5da6ac09f67fa591a77
SSDEEP 768:repK1xR2eqF+ln9wUpfL8WjTkXaKf1YuwWvScERZk8mIYkJWAEvU:S82eqFi9Ppf4Wjl2bwEEuIYdAE
TLSH
T11113E173BFE82954D4EA4B3399E2C59EC232EC310682C26EB510926F3D70759DA53387
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2872-6-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/3480-0-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/3480-2-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4644-10-0x00000000015F0000-0x00000000015F2000-memory.dmp

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memory/4644-9-0x0000000010000000-0x0000000010020000-memory.dmp

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memory/4644-11-0x0000000010000000-0x0000000010020000-memory.dmp

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memory/4644-13-0x0000000010000000-0x0000000010020000-memory.dmp

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memory/4644-14-0x0000000010000000-0x0000000010020000-memory.dmp

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memory/4644-15-0x0000000010000000-0x0000000010020000-memory.dmp

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memory/4644-16-0x0000000010000000-0x0000000010020000-memory.dmp

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