farfli | 6123cb96673cda78e356444986303e044cfa8c21448cd03c0671ffa0e170e319

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
01/08/2026, 04:50

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General

Target
2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_wannacry.exe
Size 97KB
Sample260801-fgfcrsdh84
SHA256 6123cb96673cda78e356444986303e044cfa8c21448cd03c0671ffa0e170e319
MD5 b1ec5638adcb7c9d0af7ed981dfd4bd7
SHA1 526cc7dcc18e37efc1fa93f4f3db3d627fae6e98
SHA512 7d02a63f3a08fa7d3add2810320d00bddd4ce7bb87b316b4da29b78b91830212b7d37ed8e471c4c133466cc1dc114004ab88bb04b174902c7d904a32a5f765ea
SSDEEP 1536:agDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIcIWlmy:ELRrO10TiJD9yjqrilyxOWP
TLSH
T117A3BE5D7D8288AFD0048B7107539766A6B36C69F9314F374340BA6DAF36807EED928C
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/2868-11-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/2868-13-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli
behavioral2/memory/2868-14-0x0000000010000000-0x0000000010023000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/2868-11-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2868-13-0x0000000010000000-0x0000000010023000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2868-14-0x0000000010000000-0x0000000010023000-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
2	2868	rundll32.exe
3	2868	rundll32.exe
4	2868	rundll32.exe
6	2868	rundll32.exe
7	2868	rundll32.exe
9	2868	rundll32.exe
11	2868	rundll32.exe
12	2868	rundll32.exe

Deletes itself 1 IoCs

pid	Process
5116	kkmjzgj.exe

Executes dropped EXE 1 IoCs

pid	Process
5116	kkmjzgj.exe

Loads dropped DLL 1 IoCs

pid	Process
2868	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-1-5-21-1738198120-2966725515-3980530802-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\rhmps\\nrkthngu.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)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	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
1088	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	2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_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	kkmjzgj.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
1088	cmd.exe
3816	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
3816	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2868	rundll32.exe
2868	rundll32.exe
2868	rundll32.exe
2868	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2868	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3008	2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_wannacry.exe
5116	kkmjzgj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 1088	3008	2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_wannacry.exe	89
PID 1088 wrote to memory of 3816	1088	cmd.exe	91
PID 1088 wrote to memory of 5116	1088	cmd.exe	92
PID 5116 wrote to memory of 2868	5116	kkmjzgj.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3008
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\kkmjzgj.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_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:1088
- - 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:3816
- - C:\Users\Admin\AppData\Local\Temp\kkmjzgj.exe
    C:\Users\Admin\AppData\Local\Temp\\kkmjzgj.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-01_b1ec5638adcb7c9d0af7ed981dfd4bd7_elex_feodo_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5116
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\rhmps\nrkthngu.dll",QueryPluginInterface C:\Users\Admin\AppData\Local\Temp\kkmjzgj.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:2868

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

kkmjzgj.exe

Path C:\Users\Admin\AppData\Local\Temp\kkmjzgj.exe
Size 97KB
SHA256 a3432d1f8eeee585b96965ab36eb9f462dcdad82620ff8ed03433cf97be5da00
MD5 f6fea028f9620d3c4b7e8d9c43095a64
SHA1 c2840f4bc6cfe072680c2d6337872d4b8e8e5728
SHA512 3cc47785366996d7c29d451b78632aa1545cfc2432a77e705376fb481378ec38e2d67a6aacf4d511f55af48c8015f0b5167fa5dd0e3c9d608f9e5b46324e870d
SSDEEP 1536:agDktLw4rO10tMrlk3SJDlf98jqP+8il3CxOeZIcIWlmyd:ELRrO10TiJD9yjqrilyxOWPd
TLSH
T1F4A3BE5D7D82889FE0048B7107539726A6B36C69F9314F374340BA6DAF36807EED928C
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

nrkthngu.dll

Path \??\c:\rhmps\nrkthngu.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/2868-10-0x0000000000700000-0x0000000000702000-memory.dmp

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memory/2868-9-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/2868-11-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/2868-13-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/2868-14-0x0000000010000000-0x0000000010023000-memory.dmp

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memory/3008-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3008-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5116-6-0x0000000000400000-0x0000000000417000-memory.dmp

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