farfli | e79b805d5cc713c083aa652aebf3f800454564ab615ac917bc87e0ced4922135

General

Target
2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.exe
Size 117KB
Sample260831-vg29vsdm5x
SHA256 e79b805d5cc713c083aa652aebf3f800454564ab615ac917bc87e0ced4922135
MD5 95e04510324b5f9515d409b882bf2ec4
SHA1 de53c2475c1134d660cb2fbb246cb783a0715f99
SHA512 c5d0a4d19f6ebb317628c156f1313d4b683342cdda9ce822a8e95004d83649eefd2e57f1bad49f8ea8a2c619429b4bffa7a8cc5bb15fc91b46765816d774f0e8
SSDEEP 1536:gWCfpn0RbXfmvElSdwS4ytneUDy9ZkM4A3FaJw/xfPWMywQs:gWmpn0RbXNxeeJ9w7EPWMywQs
TLSH
T10FC3C013ABAF44F5E0211D7406B91B3643B6AC5A3B245777C384EE5EA871EC0EC3D25A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli gh0strat persistence rat spyware stealer

Malware Config

Extracted

Family

gh0strat

C2

host123.zz.am:6658
http://23.104.160.115:8890/version.php
http://23.104.160.116:9963/

Attributes

user_agent
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C))

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli
Family: Gh0strat
Gh0st RAT is a remote access tool (RAT) with its source code public and it has been used by multiple Chinese groups.
rat gh0strat

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/4036-8-0x0000000010000000-0x0000000010045000-memory.dmp	family_farfli
behavioral2/memory/4036-7-0x0000000010000000-0x0000000010045000-memory.dmp	family_farfli
behavioral2/memory/4036-10-0x0000000010000000-0x0000000010045000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4036-8-0x0000000010000000-0x0000000010045000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4036-7-0x0000000010000000-0x0000000010045000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4036-10-0x0000000010000000-0x0000000010045000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
8	4036	rundll32.exe
10	4036	rundll32.exe
11	4036	rundll32.exe
12	4036	rundll32.exe

Executes dropped EXE 1 IoCs

pid	Process
2256	yxokbcyj.exe

Loads dropped DLL 1 IoCs

pid	Process
4036	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-1-5-21-2115213192-531537726-3295841909-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\cmbzl\\upatz.dll\",AbortProc"	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)	\??\l:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\g:	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

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
3208	cmd.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yxokbcyj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.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
4000	PING.EXE
3208	cmd.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
4000	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4036	rundll32.exe
4036	rundll32.exe
4036	rundll32.exe
4036	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4036	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4352	2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.exe
2256	yxokbcyj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4352 wrote to memory of 3208	4352	2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.exe	88
PID 3208 wrote to memory of 4000	3208	cmd.exe	90
PID 3208 wrote to memory of 2256	3208	cmd.exe	91
PID 2256 wrote to memory of 4036	2256	yxokbcyj.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4352
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\yxokbcyj.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-31_95e04510324b5f9515d409b882bf2ec4_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:3208
- - 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:4000
- - \??\c:\yxokbcyj.exe
    c:\yxokbcyj.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-31_95e04510324b5f9515d409b882bf2ec4_elex_wannacry.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2256
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\cmbzl\upatz.dll",AbortProc c:\yxokbcyj.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)
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4036

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

upatz.dll

Path \??\c:\cmbzl\upatz.dll
Size 60KB
SHA256 42304221991ff2ea9d6c0252d42b90390caebc312a17126a4b13e9514f2b7d87
MD5 75e08aa9274df390fcdb1df3d0733bd5
SHA1 f3053cc10f33436aa1da7ec82a12ffdaff10ccfb
SHA512 dee8a07ca2142eb2ec1a5ce56af92605bb1c11e89da5d4335aee1098dc73375e422d9c53f201e571ff64b51c5cfa3928b1f26c0a23f4671dfbd91b1355d0e9db
SSDEEP 1536:Itj4HbqT+M0L2J2US62eSBQno/CUVzsxeOPw:ItqeT+M02J25qnLUVzs9w
TLSH
T1D05301286F6D2EDDFA3152B1E0985093FBD98B03043FA24D2544777F7D829631A93BA4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

yxokbcyj.exe

Path \??\c:\yxokbcyj.exe
Size 117KB
SHA256 9c16d244aacaef6c1ff8f9374da36ba2950a685f8e202c2858be6f413a1aeecd
MD5 8bc647b07f7b45a63278f1b01dddc0a2
SHA1 f2b1ab664e133ff0ed7027038063310d8c6170cd
SHA512 d2e60b5df74dee6171a1ee38b7ad74c09c75d731fba55a3930c9bc7c4771f6a87796afc3cb7179313d0a7c703e9398670bdfe257b97f34346da1778778269171
SSDEEP 1536:gWCfpn0RbXfmvElSdwS4ytneUDy9ZkM4A3FaJw/xfPWMywQz:gWmpn0RbXNxeeJ9w7EPWMywQz
TLSH
T1F0C3C013ABAF44F5E0211D7406B91B3643B6AC5A3B245777C384EE1EA871EC0EC3D25A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4036-8-0x0000000010000000-0x0000000010045000-memory.dmp

Download

memory/4036-9-0x0000000002EC0000-0x0000000002EC1000-memory.dmp

Download

memory/4036-7-0x0000000010000000-0x0000000010045000-memory.dmp

Download

memory/4036-6-0x0000000010000000-0x0000000010045000-memory.dmp

Download

memory/4036-10-0x0000000010000000-0x0000000010045000-memory.dmp

Download

memory/4036-11-0x0000000002EC0000-0x0000000002EC1000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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