farfli | b90df4d79bec1b3e556a40727ecc97feca9e0e428dbaa5bd6e863e5e606e960d

Analysis

max time kernel
149s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
16/04/2026, 05:43

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General

Target
2026-04-16_51fa7f1d07bd52eb402212541b283fee_elex_wannacry.exe
Size 224KB
Sample260416-genrssfx2r
SHA256 b90df4d79bec1b3e556a40727ecc97feca9e0e428dbaa5bd6e863e5e606e960d
MD5 51fa7f1d07bd52eb402212541b283fee
SHA1 62dadcd6630f5b096063adddc68758767db7aaf5
SHA512 1f52bf34ec16360c1f2aef5e031dcc76a4ecdd958da1bf9a647da0e28bd1103b4f72dfc5a8913d0806c7314b92794ac0ee0b2f1189463d2e7f8945a235f158d0
SSDEEP 3072:TfwwHEzrV5x5tMBql0RZ4FjCDnO8XjDDQuMHNbwDXkLh16oVHsNqR:zwgErtcql+ZHn1PDQfwDXkN1Z
TLSH
T18B24F10B3691C9AFF06BBB75A746F1D78BD1B8283A00762E034C659F6E247CDC49126D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli persistence spyware stealer

Malware Config

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli

Detects Farfli Backdoor 2 IoCs

resource	yara_rule
behavioral2/memory/2432-12-0x0000000010000000-0x000000001006A000-memory.dmp	family_farfli
behavioral2/memory/2432-14-0x0000000010000000-0x000000001006A000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/2432-12-0x0000000010000000-0x000000001006A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/2432-14-0x0000000010000000-0x000000001006A000-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
1	2432	rundll32.exe
2	2432	rundll32.exe
3	2432	rundll32.exe
4	2432	rundll32.exe
6	2432	rundll32.exe
7	2432	rundll32.exe
8	2432	rundll32.exe
11	2432	rundll32.exe

Deletes itself 1 IoCs

pid	Process
2580	drsrk.exe

Executes dropped EXE 1 IoCs

pid	Process
2580	drsrk.exe

Loads dropped DLL 1 IoCs

pid	Process
2432	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-1-5-21-2397528088-2630719772-1129911217-1000\Software\Microsoft\Windows\CurrentVersion\Run\Dotx = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\oytlk\\xrtxwzpg.dll\",encore"	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)	\??\n:	rundll32.exe
File opened (read-only)	\??\k:	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)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	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

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2432	rundll32.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\oytlk	drsrk.exe
File created	\??\c:\Program Files\oytlk\xrtxwzpg.dll	drsrk.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	2026-04-16_51fa7f1d07bd52eb402212541b283fee_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	drsrk.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
5024	cmd.exe
5368	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
5368	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe
2432	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2432	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5088	2026-04-16_51fa7f1d07bd52eb402212541b283fee_elex_wannacry.exe
2580	drsrk.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5088 wrote to memory of 5024	5088	2026-04-16_51fa7f1d07bd52eb402212541b283fee_elex_wannacry.exe	79
PID 5024 wrote to memory of 5368	5024	cmd.exe	81
PID 5024 wrote to memory of 2580	5024	cmd.exe	82
PID 2580 wrote to memory of 2432	2580	drsrk.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-04-16_51fa7f1d07bd52eb402212541b283fee_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_51fa7f1d07bd52eb402212541b283fee_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5088
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\drsrk.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-16_51fa7f1d07bd52eb402212541b283fee_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:5024
- - 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:5368
- - C:\Users\Admin\AppData\Local\Temp\drsrk.exe
    C:\Users\Admin\AppData\Local\Temp\\drsrk.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-16_51fa7f1d07bd52eb402212541b283fee_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:2580
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\oytlk\xrtxwzpg.dll",encore C:\Users\Admin\AppData\Local\Temp\drsrk.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)
      Suspicious use of NtSetInformationThreadHideFromDebugger
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2432

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

drsrk.exe

Path C:\Users\Admin\AppData\Local\Temp\drsrk.exe
Size 225KB
SHA256 3b6dfeb6c030cdd77dfc21a0a4bf40b3ace58b9a1f23cc8209ae51fabc004d54
MD5 20937caf952554379eb950ec51f76c82
SHA1 e7ad6c97e09b26262e2c0ba4159eb1fc71335efe
SHA512 019d095225c44652143ec99f0f2735b9f2d0347a8c27b5f3bb6a58001739b961742dea4ce21581099decb02383060b6f35e33fcc78f2fefc757077396263f4a1
SSDEEP 3072:TfwwHEzrV5x5tMBql0RZ4FjCDnO8XjDDQuMHNbwDXkLh16oVHsNqRm:zwgErtcql+ZHn1PDQfwDXkN1ZU
TLSH
T1C034F10B3691C9AFF06BBB75A746F1D78BD1B8283A00762E034C659F6E247CDC49126D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

xrtxwzpg.dll

Path \??\c:\Program Files\oytlk\xrtxwzpg.dll
Size 168KB
SHA256 aef44efed5b9370e1811344e6a04bbf6cc0b334aca945941118201db99d2c7c7
MD5 a3d02c675ed474d097dfa0b7b8305f4e
SHA1 371dcb76d5cf2a9e620933bfd6afa09822aab44d
SHA512 f95446b1aa0f0032e5b4ecdd246db43149670c44867d68f4f822f0c3fc04118a593f67559a18ca29f17cb8e1ac64dace58aa1e653cb19cb9bfa3e53030d4cf9c
SSDEEP 3072:pH7O5yt++RbfRugmVWo4GYessewQpCpxGWUJtff+gVBLpBuyCjAyFzuEi:pbay5fR5eOrixfYtff+g7LpBVCjA/
TLSH
T116F3F102C7D647BAE0890375562BED7FFD30B6A08472CF3B92C791AA2C15B26655C3B1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2432-10-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/2432-11-0x0000000010052000-0x0000000010053000-memory.dmp

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memory/2432-12-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/2432-14-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/2580-7-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5088-0-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5088-2-0x0000000000400000-0x0000000000436000-memory.dmp

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