juko | 9413dcdec42622a499806be8772390573e41c6ce4b7b85512f98a532c870fd1d

General

Target
2026-08-03_7a001ebc9cf41e15080da6c1cd5b58b2_elex_wannacry.exe
Size 49KB
Sample260803-k4cydasfrd
SHA256 9413dcdec42622a499806be8772390573e41c6ce4b7b85512f98a532c870fd1d
MD5 7a001ebc9cf41e15080da6c1cd5b58b2
SHA1 6e17cc94ccc3d44b7bc2e43d631981ce0e3a63b6
SHA512 7586f9cd06056ac13e38096cc1ec915e6a4143706df5e1864350c4ac39810005526a90c9621f8ee2ace79af3f67d00be4c67fa9b5cfb0812e519e7d26a22fca6
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Z:VLy2Kerc64CiGImVucp4kojWh2Z
TLSH
T138334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/3436-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c494-5.dat	family_juko
behavioral2/memory/3436-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3220-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c495-13.dat	family_juko
behavioral2/memory/4728-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4728-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3220	WINWORD.exe
4728	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-1-5-21-3797332335-34111092-3597280141-1000\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
4736	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	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
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	2026-08-03_7a001ebc9cf41e15080da6c1cd5b58b2_elex_wannacry.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
2228	PING.EXE
5412	PING.EXE
5108	PING.EXE
4736	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2228	PING.EXE
5412	PING.EXE
5108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3436 wrote to memory of 3220	3436	2026-08-03_7a001ebc9cf41e15080da6c1cd5b58b2_elex_wannacry.exe	89
PID 3220 wrote to memory of 4736	3220	WINWORD.exe	90
PID 4736 wrote to memory of 2228	4736	cmd.exe	92
PID 4736 wrote to memory of 5412	4736	cmd.exe	93
PID 4736 wrote to memory of 5108	4736	cmd.exe	94
PID 4736 wrote to memory of 4728	4736	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_7a001ebc9cf41e15080da6c1cd5b58b2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_7a001ebc9cf41e15080da6c1cd5b58b2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3436
- 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:3220
- - 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\000007C4" 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:4736
  - - 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:2228
  - - 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:5412
  - - 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:5108
  - - 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:4728

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

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Downloads

000007C4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000007C4
Size 49KB
SHA256 b51b1ce442d5e9cecf2420fe0e7c469374b29e87e63f6ca7ec9bc7982ae4372d
MD5 727dd11ac8f44b84e0f7ac842bfc64f9
SHA1 ea3dd60020c5a0bc7eaabd56c190d70647499c4a
SHA512 922f0dfda933bb7b38a8208694258e2caae500c4c4124497a5620d44a9f11d48c90182635f285b201196510e58f05a901ef9267f6088971683a85fd9c57a8d86
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2A:VLy2Kerc64CiGImVucp4kojWh2A
TLSH
T1EA334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 9413dcdec42622a499806be8772390573e41c6ce4b7b85512f98a532c870fd1d
MD5 7a001ebc9cf41e15080da6c1cd5b58b2
SHA1 6e17cc94ccc3d44b7bc2e43d631981ce0e3a63b6
SHA512 7586f9cd06056ac13e38096cc1ec915e6a4143706df5e1864350c4ac39810005526a90c9621f8ee2ace79af3f67d00be4c67fa9b5cfb0812e519e7d26a22fca6
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Z:VLy2Kerc64CiGImVucp4kojWh2Z
TLSH
T138334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3220-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3436-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3436-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4728-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4728-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads