juko | 6474c5c4d5e74be42d62f175611e380d9e72dc7c477123e11e8b4f4232b66245

General

Target
2026-10-27_eb4893d24a42cc4d81ca748966832451_elex_wannacry.exe
Size 67KB
Sample261027-28pleaxvas
SHA256 6474c5c4d5e74be42d62f175611e380d9e72dc7c477123e11e8b4f4232b66245
MD5 eb4893d24a42cc4d81ca748966832451
SHA1 111b4222cb8a13a487af6affe7f005d58899bde4
SHA512 a894806fc2d70de184a6518bca9d433353978cf84aea9f2e8182d93825779837898bf01020733d181e877d7084619427595eacf8172d17d7b12b33d38a87d3f2
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ2:aLy2Kerc64CiGImRylFyp8TV
TLSH
T1B8633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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 6 IoCs

resource	yara_rule
behavioral2/memory/4636-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0008000000011392-4.dat	family_juko
behavioral2/memory/4636-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4876-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000900000001b894-13.dat	family_juko
behavioral2/memory/4092-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4876	WINWORD.exe
4092	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-1-5-21-461973139-3212354679-1508698038-1000\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
1148	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-27_eb4893d24a42cc4d81ca748966832451_elex_wannacry.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
2364	PING.EXE
5100	PING.EXE
4140	PING.EXE
1148	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2364	PING.EXE
5100	PING.EXE
4140	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4636 wrote to memory of 4876	4636	2026-10-27_eb4893d24a42cc4d81ca748966832451_elex_wannacry.exe	90
PID 4876 wrote to memory of 1148	4876	WINWORD.exe	91
PID 1148 wrote to memory of 2364	1148	cmd.exe	93
PID 1148 wrote to memory of 5100	1148	cmd.exe	94
PID 1148 wrote to memory of 4140	1148	cmd.exe	95
PID 1148 wrote to memory of 4092	1148	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-27_eb4893d24a42cc4d81ca748966832451_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-27_eb4893d24a42cc4d81ca748966832451_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4636
- 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:4876
- - 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\000044F6" 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:1148
  - - 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:2364
  - - 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:5100
  - - 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:4140
  - - 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:4092

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:2896

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

000044F6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000044F6
Size 67KB
SHA256 20f71c4189bcecb845beadb1bdd2c6419a86c301de67f60bf3d7e868372a0346
MD5 c06bcc5b649cdce85db6eab8ed263cd0
SHA1 c027811ea52c09e1a44937b49332ed17f820f444
SHA512 da88187d7a2b89efa993768df72e6e9c2786fe4904e6d0ceb078f7813c45af7edd9826054b876f18c19c95483a7393d5c6aa17487fc3078f6a08387fff580488
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQN:aLy2Kerc64CiGImRylFyp8TG
TLSH
T1B4633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 6474c5c4d5e74be42d62f175611e380d9e72dc7c477123e11e8b4f4232b66245
MD5 eb4893d24a42cc4d81ca748966832451
SHA1 111b4222cb8a13a487af6affe7f005d58899bde4
SHA512 a894806fc2d70de184a6518bca9d433353978cf84aea9f2e8182d93825779837898bf01020733d181e877d7084619427595eacf8172d17d7b12b33d38a87d3f2
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ2:aLy2Kerc64CiGImRylFyp8TV
TLSH
T1B8633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4092-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4636-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4636-10-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4876-12-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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