juko | 987cc501bfc53c38b872d92d32abd8bb269b0dd23e1646fb3f38382e8dd3eaff

General

Target
2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe
Size 49KB
Sample260603-eb6gbshs21
SHA256 987cc501bfc53c38b872d92d32abd8bb269b0dd23e1646fb3f38382e8dd3eaff
MD5 9c750778461e649c0a886391bad1a78c
SHA1 feadbd9f60c3995f60da6e08b10b08c4d581d1b8
SHA512 682d3d2487423644596cb87cd162f6d9fc182167ae4fd1f61d30ec260c59f4d2638adeff0e372b35c07f405ed7f040e0eb4342037d80630e59f35db551f724d0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:VLy2Kerc64CiGImVu8p4kojWh29
TLSH
T1FC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/6028-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c000000028ec9-5.dat	family_juko
behavioral2/memory/6028-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4348-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001c00000002b752-15.dat	family_juko
behavioral2/memory/6120-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/6120-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4348	WINWORD.exe
6120	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-1-5-21-1768642833-2142038154-4041560723-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-03_9c750778461e649c0a886391bad1a78c_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
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
5900	PING.EXE
1084	PING.EXE
3972	cmd.exe
5292	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5292	PING.EXE
5900	PING.EXE
1084	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6028 wrote to memory of 4348	6028	2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe	80
PID 4348 wrote to memory of 3972	4348	WINWORD.exe	81
PID 3972 wrote to memory of 5292	3972	cmd.exe	83
PID 3972 wrote to memory of 5900	3972	cmd.exe	84
PID 3972 wrote to memory of 1084	3972	cmd.exe	85
PID 3972 wrote to memory of 6120	3972	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_9c750778461e649c0a886391bad1a78c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6028
- 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:4348
- - 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\0000399A" 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:3972
  - - 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:5292
  - - 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:5900
  - - 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:1084
  - - 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:6120

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

0000399A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000399A
Size 49KB
SHA256 c5bf59fc4baef260e3fc60df2e225b4c6cba5213107aae03ac3dcb72e667fc58
MD5 9404c8e8bf6bf13f191a976c047bed6e
SHA1 1f78b188e77853d91378fffc27028eccac0ef269
SHA512 67d3f8c54f6200be0f71ae0613ebb252cc5c4356d43a8cdb5515ade7484ecd8172e6247b0dc5307f3b50de92d4a77556c3a789cd47b5d64cad42e1a81468bfea
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:VLy2Kerc64CiGImVu8p4kojWh2e
TLSH
T161334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 987cc501bfc53c38b872d92d32abd8bb269b0dd23e1646fb3f38382e8dd3eaff
MD5 9c750778461e649c0a886391bad1a78c
SHA1 feadbd9f60c3995f60da6e08b10b08c4d581d1b8
SHA512 682d3d2487423644596cb87cd162f6d9fc182167ae4fd1f61d30ec260c59f4d2638adeff0e372b35c07f405ed7f040e0eb4342037d80630e59f35db551f724d0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:VLy2Kerc64CiGImVu8p4kojWh29
TLSH
T1FC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4348-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6028-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6028-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6120-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6120-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads