juko | 942a84b3fba7b7c0f25396381a09e000e0d71ed894b05452cfe73f4154e755fa

General

Target
2026-06-01_5587f658e4a144ee0d061dd66bd2984b_elex_wannacry.exe
Size 49KB
Sample260601-kejdvsft91
SHA256 942a84b3fba7b7c0f25396381a09e000e0d71ed894b05452cfe73f4154e755fa
MD5 5587f658e4a144ee0d061dd66bd2984b
SHA1 d7d2f36b9e9254a48d919afe57ad2e657adb75cf
SHA512 f074d5a209dd6571b4d7ef773ddd464251d9d97287eba3e5b4ff383dd717e01ff19afac9499cc8502d840468c591cbba7cebfd14e10d864726c8ebf21725139f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2x:VLy2Kerc64CiGImVu8p4kojWh2x
TLSH
T122334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/1104-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0009000000000437-5.dat	family_juko
behavioral2/memory/1104-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2124-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x002400000002b208-15.dat	family_juko
behavioral2/memory/492-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/492-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2124	WINWORD.exe
492	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-1-5-21-2043432456-1617298091-2772621413-1000\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	2026-06-01_5587f658e4a144ee0d061dd66bd2984b_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
2184	cmd.exe
3412	PING.EXE
4084	PING.EXE
812	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4084	PING.EXE
812	PING.EXE
3412	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1104 wrote to memory of 2124	1104	2026-06-01_5587f658e4a144ee0d061dd66bd2984b_elex_wannacry.exe	80
PID 2124 wrote to memory of 2184	2124	WINWORD.exe	81
PID 2184 wrote to memory of 3412	2184	cmd.exe	83
PID 2184 wrote to memory of 4084	2184	cmd.exe	84
PID 2184 wrote to memory of 812	2184	cmd.exe	85
PID 2184 wrote to memory of 492	2184	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-01_5587f658e4a144ee0d061dd66bd2984b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-01_5587f658e4a144ee0d061dd66bd2984b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1104
- 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:2124
- - 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\00000C50" 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:2184
  - - 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:3412
  - - 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:4084
  - - 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:812
  - - 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:492

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

00000C50

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000C50
Size 49KB
SHA256 44e4929f2b7acc835f97646e5c37a6da88ed2ded0d88d059b1f2ef93874afdaf
MD5 822bf6593dc9abab0d685c15f53b32b9
SHA1 1233d6d357d1d9adf1776b1bcab9fa7cb5af1da0
SHA512 ae4e3c8a004d098520cc13ca9c628d91ee4078beb12aad96df1ce30ac091f22525be597d454beb908f7fe58c4edf2fdfa7d87dc67039376b3c72616f0900eefe
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2z:VLy2Kerc64CiGImVu8p4kojWh2z
TLSH
T100334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 942a84b3fba7b7c0f25396381a09e000e0d71ed894b05452cfe73f4154e755fa
MD5 5587f658e4a144ee0d061dd66bd2984b
SHA1 d7d2f36b9e9254a48d919afe57ad2e657adb75cf
SHA512 f074d5a209dd6571b4d7ef773ddd464251d9d97287eba3e5b4ff383dd717e01ff19afac9499cc8502d840468c591cbba7cebfd14e10d864726c8ebf21725139f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2x:VLy2Kerc64CiGImVu8p4kojWh2x
TLSH
T122334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/492-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/492-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1104-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1104-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2124-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads