juko | 3b17f2a3ebb5dd31eff24a7277699b0202864e622a8af7886389275229aab421

General

Target
2026-08-13_4a9bd6040399724f6f16ec9196f0e578_elex_wannacry.exe
Size 95KB
Sample260813-ssramabp4s
SHA256 3b17f2a3ebb5dd31eff24a7277699b0202864e622a8af7886389275229aab421
MD5 4a9bd6040399724f6f16ec9196f0e578
SHA1 1e05f4dbfb69157074e7ded18ac90ba609d39a0e
SHA512 750e2db4e376a7cbacb32c7846835b6db0119fca675149213e5a57807fafffe6968a5eb759b876e9f4fd9c32bda2f8713576cb8760170ef883bc551e8a7636f2
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNk:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAQ
TLSH
T1E193CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/3580-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000d000000019caa-5.dat	family_juko
behavioral2/memory/3580-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1476-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c559-13.dat	family_juko
behavioral2/memory/6124-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/6124-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1476	WINWORD.exe
6124	WINWORD.exe

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-1-5-21-4046655672-1449839301-2197395821-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
632	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-13_4a9bd6040399724f6f16ec9196f0e578_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5452	PING.EXE
632	cmd.exe
4456	PING.EXE
4752	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4456	PING.EXE
4752	PING.EXE
5452	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3580 wrote to memory of 1476	3580	2026-08-13_4a9bd6040399724f6f16ec9196f0e578_elex_wannacry.exe	89
PID 1476 wrote to memory of 632	1476	WINWORD.exe	90
PID 632 wrote to memory of 4456	632	cmd.exe	92
PID 632 wrote to memory of 4752	632	cmd.exe	93
PID 632 wrote to memory of 5452	632	cmd.exe	94
PID 632 wrote to memory of 6124	632	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-13_4a9bd6040399724f6f16ec9196f0e578_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_4a9bd6040399724f6f16ec9196f0e578_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3580
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1476
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00000D79" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:632
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4456
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4752
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5452
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:6124

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

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

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

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

00000D79

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D79
Size 95KB
SHA256 8a91ddffd6a378d1486433b8ae3624adb46013f4a7410481debde1bb5683dc90
MD5 2d5897ff3fe36e32c3215c6b7f630f28
SHA1 dbf4511b912837cdafc1c96dbf5aab708b1cefd4
SHA512 b691206e574bd2cca55c26bf498fdb860b99743a84765580a76f2a474812b3b84c43653e0dc173de4790bc9698b381a9cb8d3bfa120943d0dec0cdd53eef619d
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN7:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAn
TLSH
T10193CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 3b17f2a3ebb5dd31eff24a7277699b0202864e622a8af7886389275229aab421
MD5 4a9bd6040399724f6f16ec9196f0e578
SHA1 1e05f4dbfb69157074e7ded18ac90ba609d39a0e
SHA512 750e2db4e376a7cbacb32c7846835b6db0119fca675149213e5a57807fafffe6968a5eb759b876e9f4fd9c32bda2f8713576cb8760170ef883bc551e8a7636f2
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNk:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAQ
TLSH
T1E193CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1476-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3580-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3580-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/6124-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/6124-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads