farfli | da5ce49c64a3b40c5c83d7bd435f930658aa83892b631e56cb7c3a2a831bc6d1

Analysis

max time kernel
149s
max time network
139s
platform
windows10-2004_x64
resource
win10v2004-20260911-en
resource tags

arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
02/11/2026, 04:04

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General

Target
2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_elex_wannacry.exe
Size 96KB
Sample261102-em671azybt
SHA256 da5ce49c64a3b40c5c83d7bd435f930658aa83892b631e56cb7c3a2a831bc6d1
MD5 ed8651da48d96730b59cc8b1e2ab0407
SHA1 4872c67d01314780781b87f5522189e187295090
SHA512 e8fd952d1fda850e351039bdb284b0a3a3f759c63d36284615f75faf0b844dc3354865d40e4f7a22cc2d8782bcc87fa55d1d208e1591744d1e7a342b57b9dd15
SSDEEP 3072:NK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pE:Nl6XYeel6GGGVOO
TLSH
T160A3AE47ABA50DE5E1204DF401AB7B36937654892B25A78BC384DE0DA43EDC0DF366CE
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
behavioral1/memory/3012-11-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral1/memory/3012-13-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral1/memory/3012-14-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral1/memory/3012-15-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli
behavioral1/memory/3012-16-0x0000000010000000-0x0000000010024000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral1/memory/3012-11-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3012-13-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3012-14-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3012-15-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3012-16-0x0000000010000000-0x0000000010024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Custom signature

UPX dump on OEP (original entry point) 8 IoCs

resource	yara_rule
behavioral1/memory/1944-7-0x0000000000400000-0x0000000000417000-memory.dmp	UPX
behavioral1/files/0x0008000000024427-8.dat	UPX
behavioral1/memory/3012-10-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral1/memory/3012-11-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral1/memory/3012-13-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral1/memory/3012-14-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral1/memory/3012-15-0x0000000010000000-0x0000000010024000-memory.dmp	UPX
behavioral1/memory/3012-16-0x0000000010000000-0x0000000010024000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
10	3012	rundll32.exe
15	3012	rundll32.exe
16	3012	rundll32.exe
17	3012	rundll32.exe
30	3012	rundll32.exe
31	3012	rundll32.exe
34	3012	rundll32.exe
38	3012	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x0008000000024427-8.dat	acprotect

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
1944	xolao.exe

Executes dropped EXE 1 IoCs

pid	Process
1944	xolao.exe

Loads dropped DLL 1 IoCs

pid	Process
3012	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-1-5-21-895009113-1202185046-1686627690-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\otmfu\\xwyfizjdy.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)	\??\v:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	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
behavioral1/files/0x0008000000024427-8.dat	upx
behavioral1/memory/3012-10-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral1/memory/3012-11-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral1/memory/3012-13-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral1/memory/3012-14-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral1/memory/3012-15-0x0000000010000000-0x0000000010024000-memory.dmp	upx
behavioral1/memory/3012-16-0x0000000010000000-0x0000000010024000-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
3752	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	2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_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	xolao.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
3752	cmd.exe
4548	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
4548	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3012	rundll32.exe
3012	rundll32.exe
3012	rundll32.exe
3012	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3012	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4368	2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_elex_wannacry.exe
1944	xolao.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 3752	4368	2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_elex_wannacry.exe	86
PID 3752 wrote to memory of 4548	3752	cmd.exe	88
PID 3752 wrote to memory of 1944	3752	cmd.exe	89
PID 1944 wrote to memory of 3012	1944	xolao.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4368
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\xolao.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_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:3752
- - 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:4548
- - \??\c:\xolao.exe
    c:\xolao.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-01_ed8651da48d96730b59cc8b1e2ab0407_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1944
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\otmfu\xwyfizjdy.dll",init c:\xolao.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:3012

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

xolao.exe

Path C:\xolao.exe
Size 96KB
SHA256 08b8420b6e910200787944f04e0469c1d49dc4d03034af6543d4999f1dc62f87
MD5 308a770d1b398dd64eb02b3a73fd8289
SHA1 a45ae4dda2a9da61a1c6adc1711dd0975e23bc2d
SHA512 655ae9d05d2334191e961c6f62add63977e8e1ba3c2f19c71eb827847c1214d1dc6f292e4ccd16e7b9fa61ca9b6d36dde25e5b9dda5221893d03185305109073
SSDEEP 3072:NK4RNx6nb4RoIw/XBSeral6oaE0HGnvXuEOrc0pL:Nl6XYeel6GGGVOx
TLSH
T1ABA3AE47ABA50DD5E1204DF401AB7B36937694892F25A787D388DE0DA43EDC0DB362CE
MD5 SHA1 SHA512 SSDEEP TLSH

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xwyfizjdy.dll

Path \??\c:\otmfu\xwyfizjdy.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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memory/1944-7-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3012-10-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/3012-11-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/3012-13-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/3012-14-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/3012-15-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/3012-16-0x0000000010000000-0x0000000010024000-memory.dmp

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memory/4368-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4368-2-0x0000000000400000-0x0000000000417000-memory.dmp

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