juko | e4c5bc02ba66232459dc1efa82c78cf142fc2dc409e6eeb6e9033a03e11b3483

General

Target
2026-05-31_8081718a11bfbfa71f45755d9aeed579_elex_wannacry.exe
Size 87KB
Sample260531-jmdynsev8m
SHA256 e4c5bc02ba66232459dc1efa82c78cf142fc2dc409e6eeb6e9033a03e11b3483
MD5 8081718a11bfbfa71f45755d9aeed579
SHA1 57062bc056ab71a77240029bc2942b2610334528
SHA512 ea73e74500779c3874fd3ebbd44c0406fe967ec4e2aac08e1167fc094e04c1d4db19870e65f1ef81240e9fd52cb3b5fc12cbedbb069c145a54b53c6dd6e9bb49
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpV:2Ly2Kerc64CiGIm1K851YO6EQkwpV
TLSH
T1F193A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/2840-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x002200000002b401-5.dat	family_juko
behavioral2/memory/2840-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3840-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b5cb-15.dat	family_juko
behavioral2/memory/3312-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3312-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3840	WINWORD.exe
3312	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-1-5-21-1636999435-3883760687-346127294-1000\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	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	2026-05-31_8081718a11bfbfa71f45755d9aeed579_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

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
1448	cmd.exe
2424	PING.EXE
3468	PING.EXE
4140	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2424	PING.EXE
3468	PING.EXE
4140	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2840 wrote to memory of 3840	2840	2026-05-31_8081718a11bfbfa71f45755d9aeed579_elex_wannacry.exe	80
PID 3840 wrote to memory of 1448	3840	WINWORD.exe	81
PID 1448 wrote to memory of 2424	1448	cmd.exe	83
PID 1448 wrote to memory of 3468	1448	cmd.exe	84
PID 1448 wrote to memory of 4140	1448	cmd.exe	85
PID 1448 wrote to memory of 3312	1448	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-31_8081718a11bfbfa71f45755d9aeed579_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_8081718a11bfbfa71f45755d9aeed579_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2840
- 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:3840
- - 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\00006161" 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:1448
  - - 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:2424
  - - 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:3468
  - - 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:4140
  - - 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:3312

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

00006161

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006161
Size 87KB
SHA256 27c8cc0ae5d9e8b88bb7dfe3b0f1b2e896cb85a660de32ead0bdc9f82a5112f0
MD5 5a3a5f73dd9a9ba19eb155d40169f776
SHA1 59a9904dee7df982a78e4f20aa46621f515cb56a
SHA512 dec55405c79589c431348461f542f3ec916176db0c62c6c48ef0006067c3ea6021d0f8787e8b6cf1dd0ea84b82a4b1dac8537284c9e34fc63cc4a1f38da7eaae
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpM:2Ly2Kerc64CiGIm1K851YO6EQkwpM
TLSH
T16F93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 e4c5bc02ba66232459dc1efa82c78cf142fc2dc409e6eeb6e9033a03e11b3483
MD5 8081718a11bfbfa71f45755d9aeed579
SHA1 57062bc056ab71a77240029bc2942b2610334528
SHA512 ea73e74500779c3874fd3ebbd44c0406fe967ec4e2aac08e1167fc094e04c1d4db19870e65f1ef81240e9fd52cb3b5fc12cbedbb069c145a54b53c6dd6e9bb49
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpV:2Ly2Kerc64CiGIm1K851YO6EQkwpV
TLSH
T1F193A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2840-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2840-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3312-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3312-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3840-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads