juko | d13e0d9807a6e0da4a8d1308696136a641e177d3107860c1574b90a56ef1f15a

General

Target
2026-07-16_73b75f78bb023648e2d2fc3d3a67f516_elex_wannacry.exe
Size 87KB
Sample260716-db6awsbx6l
SHA256 d13e0d9807a6e0da4a8d1308696136a641e177d3107860c1574b90a56ef1f15a
MD5 73b75f78bb023648e2d2fc3d3a67f516
SHA1 4ec3ead55fd0e1334c6090096d9b3a4a1d26c3e5
SHA512 f6dcc35fa3058112e515f9d90485c3e368549c233c791adfb3649032b535ce0e7f1591ff83c9512347fe01334e43be6b1e089e0bdef68abf933cb838b4a400d7
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpN:2Ly2Kerc64CiGIm1K851YO6EQkwpN
TLSH
T1C993A1763A259190C48BD138E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

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

Detects Juko 8 IoCs

resource	yara_rule
behavioral2/memory/2728-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/2432-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2728-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2432-13-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c34d-14.dat	family_juko
behavioral2/memory/4208-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4208-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2432	WINWORD.exe
4208	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

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	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	2026-07-16_73b75f78bb023648e2d2fc3d3a67f516_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
3688	cmd.exe
856	PING.EXE
1784	PING.EXE
5572	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
856	PING.EXE
1784	PING.EXE
5572	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2728 wrote to memory of 2432	2728	2026-07-16_73b75f78bb023648e2d2fc3d3a67f516_elex_wannacry.exe	87
PID 2432 wrote to memory of 3688	2432	WINWORD.exe	88
PID 3688 wrote to memory of 856	3688	cmd.exe	90
PID 3688 wrote to memory of 1784	3688	cmd.exe	91
PID 3688 wrote to memory of 5572	3688	cmd.exe	92
PID 3688 wrote to memory of 4208	3688	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-16_73b75f78bb023648e2d2fc3d3a67f516_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-16_73b75f78bb023648e2d2fc3d3a67f516_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2728
- 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:2432
- - 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\000077B5" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3688
  - - 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:856
  - - 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:1784
  - - 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:5572
  - - 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:4208

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

000077B5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000077B5
Size 87KB
SHA256 dabde75d469d7eb633d038eea531e65560857f7a9584edc83f433bdbca3c4b8d
MD5 b70f0766dd09337f94c99e3b469c1335
SHA1 ceda46e8aa8ef932c771f0f0a5193495029ee19c
SHA512 3e52f4a56059c33361619670f3f7294716d54ef5e1f57354c71672cf71bad23a39f1fa0976e33c6e6e2d5d42ff5b76fcc8510275a98b6339850425b759b24392
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpH:2Ly2Kerc64CiGIm1K851YO6EQkwpH
TLSH
T18993A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 d13e0d9807a6e0da4a8d1308696136a641e177d3107860c1574b90a56ef1f15a
MD5 73b75f78bb023648e2d2fc3d3a67f516
SHA1 4ec3ead55fd0e1334c6090096d9b3a4a1d26c3e5
SHA512 f6dcc35fa3058112e515f9d90485c3e368549c233c791adfb3649032b535ce0e7f1591ff83c9512347fe01334e43be6b1e089e0bdef68abf933cb838b4a400d7
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpN:2Ly2Kerc64CiGIm1K851YO6EQkwpN
TLSH
T1C993A1763A259190C48BD138E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2432-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2432-13-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2728-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2728-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4208-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4208-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads