juko | 92c5e1666a508c9d1cef2671f899c21666836d5f9006105b12af6c92fbca1532

General

Target
2026-05-19_27f107d6adac6b20491f1969ffa80f25_elex_wannacry.exe
Size 48KB
Sample260519-asemqaex5w
SHA256 92c5e1666a508c9d1cef2671f899c21666836d5f9006105b12af6c92fbca1532
MD5 27f107d6adac6b20491f1969ffa80f25
SHA1 422342b56866681d6d37858cab8ee759396d29e8
SHA512 4f36762c7bceef73bc056001f7d578e278fa109b4cb6a5a22e6d0a9fe0875cd605667978d0e22a217aa3fe37258769ff5ee3e6decaf1a5eed03b6d54a3b8d53a
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Q:bLy2Kerc64CiGImav42j04
TLSH
T1F1234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/4620-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b328-5.dat	family_juko
behavioral2/memory/4620-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3884-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b51b-15.dat	family_juko
behavioral2/memory/5020-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5020-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3884	WINWORD.exe
5020	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-1-5-21-2654269261-3199571979-4291878722-1000\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	2026-05-19_27f107d6adac6b20491f1969ffa80f25_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
4460	cmd.exe
1836	PING.EXE
1160	PING.EXE
5160	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1836	PING.EXE
1160	PING.EXE
5160	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4620 wrote to memory of 3884	4620	2026-05-19_27f107d6adac6b20491f1969ffa80f25_elex_wannacry.exe	81
PID 3884 wrote to memory of 4460	3884	WINWORD.exe	82
PID 4460 wrote to memory of 1836	4460	cmd.exe	84
PID 4460 wrote to memory of 1160	4460	cmd.exe	85
PID 4460 wrote to memory of 5160	4460	cmd.exe	86
PID 4460 wrote to memory of 5020	4460	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-19_27f107d6adac6b20491f1969ffa80f25_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-19_27f107d6adac6b20491f1969ffa80f25_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4620
- 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:3884
- - 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\000028D0" 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:4460
  - - 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:1836
  - - 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:1160
  - - 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:5160
  - - 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:5020

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

000028D0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000028D0
Size 48KB
SHA256 4ff95301c957843f8c3e6e648d2ac693cbfd2ce1ecd5b1ef8b9242609559439e
MD5 45704c1bce8a31f20793043b44a2fe17
SHA1 6aa58445eab266927cfb23e27f703ada0f65ad30
SHA512 5a552928af7b5a025cbdf43e6afb60537d96402a20363c274dfb43c58913feed60e14bd9fce06a3970f80aeafa19c7d2b65186e458a9124a77faea9d7beef8a6
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Y:bLy2Kerc64CiGImav42j0A
TLSH
T1E2234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 92c5e1666a508c9d1cef2671f899c21666836d5f9006105b12af6c92fbca1532
MD5 27f107d6adac6b20491f1969ffa80f25
SHA1 422342b56866681d6d37858cab8ee759396d29e8
SHA512 4f36762c7bceef73bc056001f7d578e278fa109b4cb6a5a22e6d0a9fe0875cd605667978d0e22a217aa3fe37258769ff5ee3e6decaf1a5eed03b6d54a3b8d53a
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Q:bLy2Kerc64CiGImav42j04
TLSH
T1F1234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3884-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4620-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4620-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5020-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5020-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads