juko | 7a13f0657e9baab065261b5e0209aa02f1bbe24815da0c484562f81eb0963ef3

General

Target
2026-06-05_45cbcf7d5d519f5641f33f5185b59797_elex_wannacry.exe
Size 49KB
Sample260605-2d3vjsfx8m
SHA256 7a13f0657e9baab065261b5e0209aa02f1bbe24815da0c484562f81eb0963ef3
MD5 45cbcf7d5d519f5641f33f5185b59797
SHA1 c3f2294d6855ba7eae6a9c8b01730ebaa1840943
SHA512 30529c233d5cdd64f415d84859125008b338590d9668d6e4b1e61434e1f921c165c5c7276127ebca124509a624da65f27adb19469e646f8841ebc19cc364ef54
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2t:VLy2Kerc64CiGImVu8p4kojWh2t
TLSH
T129334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2416-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0014000000025ad8-5.dat	family_juko
behavioral2/memory/2416-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2588-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b568-15.dat	family_juko
behavioral2/memory/1008-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1008-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2588	WINWORD.exe
1008	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-1-5-21-2746394149-3500112804-1243524366-1000\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	2026-06-05_45cbcf7d5d519f5641f33f5185b59797_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
1772	cmd.exe
4944	PING.EXE
3196	PING.EXE
772	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4944	PING.EXE
3196	PING.EXE
772	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2416 wrote to memory of 2588	2416	2026-06-05_45cbcf7d5d519f5641f33f5185b59797_elex_wannacry.exe	80
PID 2588 wrote to memory of 1772	2588	WINWORD.exe	81
PID 1772 wrote to memory of 4944	1772	cmd.exe	83
PID 1772 wrote to memory of 3196	1772	cmd.exe	84
PID 1772 wrote to memory of 772	1772	cmd.exe	85
PID 1772 wrote to memory of 1008	1772	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-05_45cbcf7d5d519f5641f33f5185b59797_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-05_45cbcf7d5d519f5641f33f5185b59797_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2416
- 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:2588
- - 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\000000FE" 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:1772
  - - 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:4944
  - - 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:3196
  - - 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:772
  - - 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:1008

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

000000FE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000000FE
Size 49KB
SHA256 0bdfe5ef506bda9f91a8f4118c80fe3962eba15c85a7203ba396d10a6dd2507c
MD5 f4712ac287c444a41ca5165433bcc6c4
SHA1 4fe98bb8ea2610a6851a771cc9a515eeb19f03c3
SHA512 945a5e39e44adff899492fd4138a5f340890d7bc6d2dce5c83ae89c1cda04f3d26035797924ff8cc6c8bc41ef73e14c4590ac38411085ffad6bd0d4d586b427e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2T:VLy2Kerc64CiGImVu8p4kojWh2T
TLSH
T13D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 7a13f0657e9baab065261b5e0209aa02f1bbe24815da0c484562f81eb0963ef3
MD5 45cbcf7d5d519f5641f33f5185b59797
SHA1 c3f2294d6855ba7eae6a9c8b01730ebaa1840943
SHA512 30529c233d5cdd64f415d84859125008b338590d9668d6e4b1e61434e1f921c165c5c7276127ebca124509a624da65f27adb19469e646f8841ebc19cc364ef54
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2t:VLy2Kerc64CiGImVu8p4kojWh2t
TLSH
T129334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1008-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1008-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2416-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2416-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2588-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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