farfli | 1d81ebf878fca8c94e0a377c3bcfaf92a961fc328f9c7e88778b74fe86946be2

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
29/10/2026, 05:53

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General

Target
2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_elex_wannacry.exe
Size 95KB
Sample261029-glbqtaad34
SHA256 1d81ebf878fca8c94e0a377c3bcfaf92a961fc328f9c7e88778b74fe86946be2
MD5 cf56ba7b8b49224e2afd4a67074eefc6
SHA1 d038825a86a96403b7ddc3df2b9015266c8b179e
SHA512 fe81824792d09e1b4a5987add0b7c2823357165ffcb6447fbedac79bedc97e322e7906d33c0700a5a03fe6d34530f9cee87e6c679903a274bad453f63e593540
SSDEEP 1536:SaK4RNx6nb4RoIw/vvBSxXsral6x2aE0zLve2yESXGTBcvt8UaKW40AEEoG:xK4RNx6nb4RoIw/XBSeral6oaE0HGnvt
TLSH
T19EA3BF47ABA54DE5E1214DF001AB7B35937694892B21A797C384DE0DA43EEC0DF362CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion discovery execution farfli persistence spyware stealer upx

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/1068-10-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1068-12-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1068-13-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1068-14-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral2/memory/1068-15-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral2/memory/1068-10-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1068-12-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1068-13-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1068-14-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1068-15-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Custom signature

UPX dump on OEP (original entry point) 8 IoCs

resource	yara_rule
behavioral2/memory/5056-6-0x0000000000400000-0x0000000000417000-memory.dmp	UPX
behavioral2/files/0x000d00000001c5da-7.dat	UPX
behavioral2/memory/1068-9-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1068-10-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1068-12-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1068-13-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1068-14-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral2/memory/1068-15-0x0000000010000000-0x0000000010024000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
1	1068	rundll32.exe
2	1068	rundll32.exe
3	1068	rundll32.exe
4	1068	rundll32.exe
5	1068	rundll32.exe
6	1068	rundll32.exe
7	1068	rundll32.exe
8	1068	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000d00000001c5da-7.dat	acprotect

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
5056	xffahc.exe

Executes dropped EXE 1 IoCs

pid	Process
5056	xffahc.exe

Loads dropped DLL 1 IoCs

pid	Process
1068	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-1-5-21-2714045687-1127350534-2056456672-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\njjjq\\eosmrwrzx.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)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\o:	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)	\??\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)	\??\y:	rundll32.exe
File opened (read-only)	\??\j:	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)	\??\s:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	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

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x000d00000001c5da-7.dat	upx
behavioral2/memory/1068-9-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1068-10-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1068-12-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1068-13-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1068-14-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral2/memory/1068-15-0x0000000010000000-0x0000000010024000-memory.dmp	upx

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
5028	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	xffahc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_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

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
5028	cmd.exe
1056	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
1056	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1068	rundll32.exe
1068	rundll32.exe
1068	rundll32.exe
1068	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1068	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4664	2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_elex_wannacry.exe
5056	xffahc.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4664 wrote to memory of 5028	4664	2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_elex_wannacry.exe	90
PID 5028 wrote to memory of 1056	5028	cmd.exe	92
PID 5028 wrote to memory of 5056	5028	cmd.exe	93
PID 5056 wrote to memory of 1068	5056	xffahc.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4664
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\xffahc.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_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:5028
- - 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:1056
- - \??\c:\xffahc.exe
    c:\xffahc.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-28_cf56ba7b8b49224e2afd4a67074eefc6_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5056
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\njjjq\eosmrwrzx.dll",init c:\xffahc.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:1068

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

Replay Monitor

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Downloads

eosmrwrzx.dll

Path \??\c:\njjjq\eosmrwrzx.dll
Size 46KB
SHA256 b6bc7902da0250f6ca920b35b222f6a0fe62102caf05d2a1722c4d3b225a0a9e
MD5 42fe886bcb6460f7c2a46e21ecac5da6
SHA1 7d9a1c9fe17121cf61444da965f29e974a95ede2
SHA512 3d1a7dc1d9ca8a4376302ba20df584ad59b98e0d3b18b06b22d7f5a455833ce124e412fc1922a3b704dcbafa31987cda3115c9a71dd6299683502cebae33567c
SSDEEP 768:P60NIyOvlPSGxZ00FBsMT0fdB5h3vU7ExCClpoduUglNgLoR/C:P6e4lP5rvz1Vd8H/C
TLSH
T10023F15733A8577BC9E621FA3263BE142B357019CB3A83545CB9B6572C21C8D927930F
MD5 SHA1 SHA512 SSDEEP TLSH

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xffahc.exe

Path \??\c:\xffahc.exe
Size 96KB
SHA256 05c3ef459b225ae4b03bb8bb41634735d6c7e0c3090444b44b10649303c432a4
MD5 23bedb80140f0f879bff541e561b20d2
SHA1 3098ae6a670e38cc779f78e8223a1ad1574d5224
SHA512 85bd2e30efe0db79d98c4a49481de8111fc484ffc48ffd9324b57c6decdd6116464b663645ec3de9b4fd6307e3bc06eac404a60d4269e78c6e36554724cd6306
SSDEEP 3072:xK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pp:xl6XYeel6GGGVOv
TLSH
T12EA3BF47ABA50DE5E1215DF001AB7B35537694892B25A397C384DE0EA43EEC0DF362CE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1068-9-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1068-10-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1068-12-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1068-13-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1068-14-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/1068-15-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4664-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4664-2-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/5056-6-0x0000000000400000-0x0000000000417000-memory.dmp

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