farfli | 34e2d944b03455ae990a140ec65350522f9eeef02b0728d51aedb55cb66c5397

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
04/06/2026, 20:39

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General

Target
2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_elex_wannacry.exe
Size 217KB
Sample260604-zfd8vsd18t
SHA256 34e2d944b03455ae990a140ec65350522f9eeef02b0728d51aedb55cb66c5397
MD5 a81c2862a3b3b4be68e13eb4582bcbd3
SHA1 3f68126f9331527c02b7de6c7d4692f239f3e7cc
SHA512 a7793378cd21459d3e718c694e7e63412f835fe36a83eff28739a593fa7c98ee43068fdae47988dab9f83409081c1bc48aefe4b85557c0fc8501fdeff9c83042
SSDEEP 3072:TfwwHEzrV5x5tMBql0RZ4FjCDnO8XjDDQuMHNbwDXkLh16oVHeR:zwgErtcql+ZHn1PDQfwDXkN1Z
TLSH
T13824F1177A81C9AFF00BFB759746F0C78BD0A4283F40762E038C659E9B217CAC5961AD
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/4032-14-0x0000000010000000-0x000000001006A000-memory.dmp	family_farfli
behavioral2/memory/4032-15-0x0000000010000000-0x000000001006A000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4032-14-0x0000000010000000-0x000000001006A000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4032-15-0x0000000010000000-0x000000001006A000-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	4032	rundll32.exe
2	4032	rundll32.exe
3	4032	rundll32.exe
4	4032	rundll32.exe
5	4032	rundll32.exe
6	4032	rundll32.exe
7	4032	rundll32.exe
8	4032	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3788	pimmac.exe

Executes dropped EXE 1 IoCs

pid	Process
3788	pimmac.exe

Loads dropped DLL 1 IoCs

pid	Process
4032	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-1-5-21-2824035265-2271499813-2042964211-1000\Software\Microsoft\Windows\CurrentVersion\Run\Dotx = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\annuqt\\bigzr.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)	\??\k:	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)	\??\w:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	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
4032	rundll32.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	\??\c:\Program Files\annuqt\bigzr.dll	pimmac.exe
File opened for modification	\??\c:\Program Files\annuqt	pimmac.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	2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_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	pimmac.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
1504	cmd.exe
4508	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
4508	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe
4032	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4032	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
444	2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_elex_wannacry.exe
3788	pimmac.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 444 wrote to memory of 1504	444	2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_elex_wannacry.exe	81
PID 1504 wrote to memory of 4508	1504	cmd.exe	83
PID 1504 wrote to memory of 3788	1504	cmd.exe	84
PID 3788 wrote to memory of 4032	3788	pimmac.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:444
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\pimmac.exe "C:\Users\Admin\AppData\Local\Temp\2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1504
- - 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:4508
- - C:\Users\Admin\AppData\Local\Temp\pimmac.exe
    C:\Users\Admin\AppData\Local\Temp\\pimmac.exe "C:\Users\Admin\AppData\Local\Temp\2026-06-04_a81c2862a3b3b4be68e13eb4582bcbd3_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:3788
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\annuqt\bigzr.dll",encore C:\Users\Admin\AppData\Local\Temp\pimmac.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:4032

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

pimmac.exe

Path C:\Users\Admin\AppData\Local\Temp\pimmac.exe
Size 217KB
SHA256 a85fa5eff6a542efcde775721bfac9c38e0564494fecb6261a5bc7a5b67c5263
MD5 80968f5bcbbaeb4c26c63c6e98542a8c
SHA1 677134a51c58a36416e93e36cbb2d492ba366685
SHA512 e70ea8a3f85c2725167754e2980155cdf0fb8bd03952f2170fd2bd6b52de755c852373ca4a820e7ae8071863aab951c64244c55d221092aa6607f56d67ebeff0
SSDEEP 3072:TfwwHEzrV5x5tMBql0RZ4FjCDnO8XjDDQuMHNbwDXkLh16oVHeRG:zwgErtcql+ZHn1PDQfwDXkN1Zn
TLSH
T17624F1177681C9AFF00BFB759746F4C78BD0A4283F40762E038C659E9B217CAC5951AD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

bigzr.dll

Path \??\c:\Program Files\annuqt\bigzr.dll
Size 168KB
SHA256 48e4bb43b254e90c010d3dcec19eabbec9c16f2ef7cb72b5be87d1da26bf986a
MD5 bcfb332589cbeb09fd7b539cbeede887
SHA1 adfc2ed1bd949d2fa37baf85c8f4819477e90096
SHA512 b014b15e6e372c686abc10b78c8d7814a2d97ab93ddc51667e4432f8ae2d361c927c8f1807b60a009c06f39cc9b0d4f13cd15a36df29ce61f16ca53df151def1
SSDEEP 3072:pH7O5yt++RbfRugmVWo4GYessewQpCpxGWUJtff+gVBLpBuyCjAyFzu1:pbay5fR5eOrixfYtff+g7LpBVCjA1
TLSH
T1FCF3E133F78247BAE0890375151BEC7FBC20A690837E8E2792CF519A2F156E56D5C3A1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/444-0-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/444-2-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/3788-6-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/3788-8-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/4032-11-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/4032-14-0x0000000010000000-0x000000001006A000-memory.dmp

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memory/4032-12-0x0000000010052000-0x0000000010053000-memory.dmp

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memory/4032-15-0x0000000010000000-0x000000001006A000-memory.dmp

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