juko | cbcb18c0e3941cd9dc5f545f0c41bd6adefbfdeff3e3d4466cb78fa745204d31

General

Target
2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe
Size 39KB
Sample260808-wha3faeg55
SHA256 cbcb18c0e3941cd9dc5f545f0c41bd6adefbfdeff3e3d4466cb78fa745204d31
MD5 5324ff4bd551ffe28ed0a45b3d659990
SHA1 004b82d1a9a42cb69d50b08f14876b52320995c6
SHA512 4c5ec6dbdef74869fbc49c03f2fc48fb70b897452593360d645a7674b47a928ef9512ac476bfca6353d78b30333286153e6748e702d5cbc649842718426da920
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBt:aLsF2Kerc64sTiX2IV0DVyIGFS
TLSH
T1FF036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1236-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000019c8f-5.dat	family_juko
behavioral2/memory/1236-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3752-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c3db-13.dat	family_juko
behavioral2/memory/596-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/596-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3752	WINWORD.exe
596	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-1-5-21-1079202589-886135813-2527035092-1000\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
4480	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	2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_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
4976	PING.EXE
5912	PING.EXE
4480	cmd.exe
3096	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3096	PING.EXE
4976	PING.EXE
5912	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1236 wrote to memory of 3752	1236	2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe	89
PID 3752 wrote to memory of 4480	3752	WINWORD.exe	90
PID 4480 wrote to memory of 3096	4480	cmd.exe	92
PID 4480 wrote to memory of 4976	4480	cmd.exe	93
PID 4480 wrote to memory of 5912	4480	cmd.exe	94
PID 4480 wrote to memory of 596	4480	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1236
- 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:3752
- - 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\00002E32" 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:4480
  - - 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:3096
  - - 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:4976
  - - 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:5912
  - - 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:596

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

00002E32

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E32
Size 39KB
SHA256 5de2257602883824f1094ca8f24cbc9b65fbfc61d53d02f9e63690aaa8be04c8
MD5 03e185023f5d741773493f1b09cedc9c
SHA1 1272bbfb9aa174894965413d8dd6f4d66e543377
SHA512 fbf377008e83bfe2f4598ef7f7c23303ae6fd83c186398115e6843c47c8bc9038fff304793e65c8b2ef5aa823b66b125b908d2bb9456d02188058885e8787986
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBx:aLsF2Kerc64sTiX2IV0DVyIGFe
TLSH
T126036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 cbcb18c0e3941cd9dc5f545f0c41bd6adefbfdeff3e3d4466cb78fa745204d31
MD5 5324ff4bd551ffe28ed0a45b3d659990
SHA1 004b82d1a9a42cb69d50b08f14876b52320995c6
SHA512 4c5ec6dbdef74869fbc49c03f2fc48fb70b897452593360d645a7674b47a928ef9512ac476bfca6353d78b30333286153e6748e702d5cbc649842718426da920
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBt:aLsF2Kerc64sTiX2IV0DVyIGFS
TLSH
T1FF036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/596-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/596-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1236-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1236-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3752-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads