farfli | 618f7163d6482f15d441f3a7fc76de69c1d9233e50391e23366b2f420f52a6f7

Analysis

max time kernel
149s
max time network
135s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
18/04/2026, 14:04

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General

Target
2026-04-18_c4da2822d629285236e91dc71758be7e_elex_wannacry.exe
Size 214KB
Sample260418-rdfd5sbs7s
SHA256 618f7163d6482f15d441f3a7fc76de69c1d9233e50391e23366b2f420f52a6f7
MD5 c4da2822d629285236e91dc71758be7e
SHA1 a54d6865007d7ab1b9837c4b1b47424a0834fbd7
SHA512 0dbf2e2b0bfab4c0f6488f876a6cf1c1a8486e7032567ea4c1dbc9c13ac2e01a1fdca495e8d842449817014eab077dbeeb85f1f1384bfa268dc43afce6f3ae17
SSDEEP 3072:TfwwHEzrV5x5tMBql0RZ4FjCDnO8XjDDQuMHNbwDXkLh16oVHeS:zwgErtcql+ZHn1PDQfwDXkN1Zh
TLSH
T18424F1173A8189AFF00BFB76A746F4C78BD0A4283F44762F038C659E5B217CAC5951AD
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/4964-12-0x0000000010000000-0x000000001006A000-memory.dmp	family_farfli
behavioral2/memory/4964-14-0x0000000010000000-0x000000001006A000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4964-12-0x0000000010000000-0x000000001006A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4964-14-0x0000000010000000-0x000000001006A000-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	4964	rundll32.exe
2	4964	rundll32.exe
3	4964	rundll32.exe
4	4964	rundll32.exe
6	4964	rundll32.exe
7	4964	rundll32.exe
8	4964	rundll32.exe
11	4964	rundll32.exe

Deletes itself 1 IoCs

pid	Process
5000	jtbxp.exe

Executes dropped EXE 1 IoCs

pid	Process
5000	jtbxp.exe

Loads dropped DLL 1 IoCs

pid	Process
4964	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-1-5-21-600123060-2148212387-2211176695-1000\Software\Microsoft\Windows\CurrentVersion\Run\Dotx = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\oosch\\xvgzirudc.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)	\??\g:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	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)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\z:	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
4964	rundll32.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\oosch	jtbxp.exe
File created	\??\c:\Program Files\oosch\xvgzirudc.dll	jtbxp.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	2026-04-18_c4da2822d629285236e91dc71758be7e_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	jtbxp.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
5996	cmd.exe
3328	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
3328	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4964	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5052	2026-04-18_c4da2822d629285236e91dc71758be7e_elex_wannacry.exe
5000	jtbxp.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5052 wrote to memory of 5996	5052	2026-04-18_c4da2822d629285236e91dc71758be7e_elex_wannacry.exe	78
PID 5996 wrote to memory of 3328	5996	cmd.exe	80
PID 5996 wrote to memory of 5000	5996	cmd.exe	81
PID 5000 wrote to memory of 4964	5000	jtbxp.exe	82

C:\Users\Admin\AppData\Local\Temp\2026-04-18_c4da2822d629285236e91dc71758be7e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-18_c4da2822d629285236e91dc71758be7e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5052
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\jtbxp.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-18_c4da2822d629285236e91dc71758be7e_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:5996
- - 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:3328
- - C:\Users\Admin\AppData\Local\Temp\jtbxp.exe
    C:\Users\Admin\AppData\Local\Temp\\jtbxp.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-18_c4da2822d629285236e91dc71758be7e_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:5000
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\oosch\xvgzirudc.dll",encore C:\Users\Admin\AppData\Local\Temp\jtbxp.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:4964

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

jtbxp.exe

Path C:\Users\Admin\AppData\Local\Temp\jtbxp.exe
Size 214KB
SHA256 c9e83040300a2ec144a3bcc8f1efc1a6341aca6836af7954ecf7bf46b6c70cb9
MD5 0160d8ccb63878897dcf9ddfd9023c8d
SHA1 7fbf0728f95fd62cccd9377ecdad017c14d80e3f
SHA512 cbdc342976efd9884e825597827f9203ced217f8715bf07c0d73da1b9a25ca189f7814e134458e9b889e3a8bc3aa55c4b998524030e50cc557da59a65f80932d
SSDEEP 3072:TfwwHEzrV5x5tMBql0RZ4FjCDnO8XjDDQuMHNbwDXkLh16oVHe8:zwgErtcql+ZHn1PDQfwDXkN1ZN
TLSH
T1F424F1173A8189AFF00BFB76A746F4C78BD0A4283F44762F038C659E5B217CAC5951AD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

xvgzirudc.dll

Path \??\c:\Program Files\oosch\xvgzirudc.dll
Size 168KB
SHA256 fa5615955fbf6ade774062c34f03f67efd4687d74aea1d1db3d4e10eca41ccbf
MD5 328e1a35dec02d973938feac1080c566
SHA1 4ee2904815c32acd3cf0989d8424eddac7fb0f3a
SHA512 936068b03c4f09281605351b0b077b1df277226fc850d3463432b855d74160e78da5091fdf5e23238713edee6d5112a6a7a3a032252642c7f9572f200077e627
SSDEEP 3072:pH7O5yt++RbfRugmVWo4GYessewQpCpxGWUJtff+gVBLpBuyCjAyFzu5:pbay5fR5eOrixfYtff+g7LpBVCjA5
TLSH
T16FF3E133F78247BAE0890375151BEC7FBC20A690833E8E2792CF519A2F156E56D5C3A1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4964-10-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/4964-11-0x0000000010052000-0x0000000010053000-memory.dmp

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memory/4964-12-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/4964-14-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/4964-15-0x00000000029A0000-0x0000000002A7A000-memory.dmp

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memory/5000-7-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5052-0-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5052-2-0x0000000000400000-0x0000000000436000-memory.dmp

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