juko | 6ac21964a73249922d557f36b2876a1d51b6322f160e7b477117ace35f847f47

General

Target
2026-11-01_8d78aca9d02b98a5ec6db266629769f3_elex_wannacry.exe
Size 49KB
Sample261102-sl2ssavtb1
SHA256 6ac21964a73249922d557f36b2876a1d51b6322f160e7b477117ace35f847f47
MD5 8d78aca9d02b98a5ec6db266629769f3
SHA1 4cc89e1ca171cf4af21a0b2d0a4a83c63935a020
SHA512 a45a6e3f60d15c9572ae16bedb1bcf33f9799566d7d9773a35847e73dd7d9fcbe6b81d4eb374120dbf35175fe2849ea3fcb39effe4a03140d1c871d35844ce1d
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h21:VLy2Kerc64CiGImVu8p4kojWh21
TLSH
T1A4334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/6072-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001b8b0-4.dat	family_juko
behavioral2/memory/6072-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4836-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5fa-13.dat	family_juko
behavioral2/memory/2812-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2812-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4836	WINWORD.exe
2812	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-1-5-21-1262770251-41185387-1005173349-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2604	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe

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	2026-11-01_8d78aca9d02b98a5ec6db266629769f3_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
2604	cmd.exe
4332	PING.EXE
124	PING.EXE
5420	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4332	PING.EXE
124	PING.EXE
5420	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6072 wrote to memory of 4836	6072	2026-11-01_8d78aca9d02b98a5ec6db266629769f3_elex_wannacry.exe	90
PID 4836 wrote to memory of 2604	4836	WINWORD.exe	91
PID 2604 wrote to memory of 4332	2604	cmd.exe	93
PID 2604 wrote to memory of 124	2604	cmd.exe	94
PID 2604 wrote to memory of 5420	2604	cmd.exe	95
PID 2604 wrote to memory of 2812	2604	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-11-01_8d78aca9d02b98a5ec6db266629769f3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-01_8d78aca9d02b98a5ec6db266629769f3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6072
- 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:4836
- - 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\000028E7" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2604
  - - 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:4332
  - - 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:124
  - - 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:5420
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2812

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000028E7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000028E7
Size 49KB
SHA256 937a12a361fb196dab8df9644d1fb3da5851ea04b291445ac032ba7493499b18
MD5 4df22a9513d97dbbe518f7dd0bbda1a8
SHA1 74e7a550a15d2d815deff3f9268b405e910b9d24
SHA512 01c0be31ca1d5ba2b0154b38d97675e1aedf7ff11d129009987a28c6a317a8dfe2286733f1be173c425d33f8ee8d0df94ee36ee2358c11bef31a27985f0464c7
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2J:VLy2Kerc64CiGImVu8p4kojWh2J
TLSH
T19F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 6ac21964a73249922d557f36b2876a1d51b6322f160e7b477117ace35f847f47
MD5 8d78aca9d02b98a5ec6db266629769f3
SHA1 4cc89e1ca171cf4af21a0b2d0a4a83c63935a020
SHA512 a45a6e3f60d15c9572ae16bedb1bcf33f9799566d7d9773a35847e73dd7d9fcbe6b81d4eb374120dbf35175fe2849ea3fcb39effe4a03140d1c871d35844ce1d
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h21:VLy2Kerc64CiGImVu8p4kojWh21
TLSH
T1A4334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2812-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2812-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4836-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/6072-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/6072-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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