farfli | 861b086a0268342d68fa8e06523b94f80bcfb54192ed13be2dd7e6b26da6adb9

Analysis

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

arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
02/10/2026, 15:25

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General

Target
2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_elex_wannacry.exe
Size 406KB
Sample261002-stzcmaxsgv
SHA256 861b086a0268342d68fa8e06523b94f80bcfb54192ed13be2dd7e6b26da6adb9
MD5 48f5ded1e95f19a47cfc9c52da12f3de
SHA1 bc1ed531b18ac1a3b6aca8d0934cab11eae9d1a0
SHA512 5c755140c522025c671781515b6cd35a4722a7127c5f4778c89aabdf04d82442bb2153a081bd5cf6d71a8de2b72792e2f38c792bcea1f0f231ea034398f0cbf8
SSDEEP 6144:qKgGmTBsuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F19Sj:UGmTau+mMC4ITJE8dfSJ/F1Q
TLSH
T1A394D02272D08BA3C1866032CDA6EA7CD3E5CD689C705E3773E9F65DDE36941423A274
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 3 IoCs

resource	yara_rule
behavioral1/memory/1680-10-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral1/memory/1680-12-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli
behavioral1/memory/1680-14-0x0000000010000000-0x0000000010067000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral1/memory/1680-10-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1680-12-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1680-14-0x0000000010000000-0x0000000010067000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral1/memory/1764-0-0x0000000000400000-0x0000000000492000-memory.dmp	UPX
behavioral1/memory/1764-2-0x0000000000400000-0x0000000000492000-memory.dmp	UPX
behavioral1/files/0x00070000000004eb-4.dat	UPX
behavioral1/memory/2196-7-0x0000000000400000-0x0000000000492000-memory.dmp	UPX

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
29	1680	rundll32.exe
35	1680	rundll32.exe
36	1680	rundll32.exe
52	1680	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
2196	yxwkm.exe

Executes dropped EXE 1 IoCs

pid	Process
2196	yxwkm.exe

Loads dropped DLL 1 IoCs

pid	Process
1680	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\D3D = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\vhkcf\\bdtzobfab.dll\",InitEngine"	rundll32.exe

Enumerates connected drives 3 TTPs 24 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)	\??\s:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
	\??\f:\	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\n:	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)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	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

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	\??\c:\Program Files\vhkcf\bdtzobfab.dll	yxwkm.exe
File opened for modification	\??\c:\Program Files\vhkcf	yxwkm.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
1060	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	2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_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	yxwkm.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
1060	cmd.exe
436	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
436	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1680	rundll32.exe
1680	rundll32.exe
1680	rundll32.exe
1680	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1680	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1764	2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_elex_wannacry.exe
2196	yxwkm.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1764 wrote to memory of 1060	1764	2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_elex_wannacry.exe	87
PID 1060 wrote to memory of 436	1060	cmd.exe	89
PID 1060 wrote to memory of 2196	1060	cmd.exe	93
PID 2196 wrote to memory of 1680	2196	yxwkm.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1764
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\yxwkm.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_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:1060
- - 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:436
- - C:\Users\Admin\AppData\Local\Temp\yxwkm.exe
    C:\Users\Admin\AppData\Local\Temp\\yxwkm.exe "C:\Users\Admin\AppData\Local\Temp\2026-10-01_48f5ded1e95f19a47cfc9c52da12f3de_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2196
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\vhkcf\bdtzobfab.dll",InitEngine C:\Users\Admin\AppData\Local\Temp\yxwkm.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:1680

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

yxwkm.exe

Path C:\Users\Admin\AppData\Local\Temp\yxwkm.exe
Size 406KB
SHA256 09c7ddb4ba44bb7712217d2476f30061ba93b96fd30b3d7e25f08eac1dfe37ab
MD5 413d5cf074d630256cbe83e04090b238
SHA1 b5090932841af61c0837c12462ac501be0321745
SHA512 6b048ecbcd132acda5f672d09a0de2cad28c3d465ab98b38fca7b963f260d061655b913d19ee0d766e46a0b18c4ecf1db8d082f9b97ba8c381add19a3d051790
SSDEEP 6144:qKgGmTBsuFIsBMkVuq4nITJJVn0wOa7sNvYfSkk/F19SM:UGmTau+mMC4ITJE8dfSJ/F1x
TLSH
T1A494D02272D08BA3C1866032CDA6EA7CD3E5CD689C705E3773E9F65DDE36941423A274
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

bdtzobfab.dll

Path \??\c:\Program Files\vhkcf\bdtzobfab.dll
Size 176KB
SHA256 a13e4793d79ce60c4348f3b8c4865eaad0e3c06aed9b3b5b2e3ac7d2c35700b7
MD5 5dbeb3cf759ecda0d74c70ee196756f9
SHA1 f18e1902b2439ae0c7f04d0162c093719551d583
SHA512 c4d2fc9f5b3e13c66451e682c92bab25c6a954b37d3e6cb0d8e4e4e88ec1c8841b79ee25c30b3448bc3107ba4e64f0aadab6b19d21fd00bd20d897d23f51fefb
SSDEEP 3072:KiDJQVl82dm+NBiPAaHDb0gL/CyGbEPVMnY0RVjatbmKb6DWSFooc+:1Jv2tOItshGYdMnYYVjasKbOWSFof+
TLSH
T14A041271862D1C34D087B7717B05920DF6B452A49179CB93F7B8AF2B3D12AEA806E353
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1680-10-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/1680-13-0x000000001005A000-0x000000001005B000-memory.dmp

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memory/1680-12-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/1680-14-0x0000000010000000-0x0000000010067000-memory.dmp

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memory/1764-0-0x0000000000400000-0x0000000000492000-memory.dmp

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memory/1764-2-0x0000000000400000-0x0000000000492000-memory.dmp

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memory/2196-7-0x0000000000400000-0x0000000000492000-memory.dmp

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