juko | 1bb67cc9baafc954ba2c6875039751c9384671ec06d7e3539e842900fdb6d198

General

Target
2026-10-11_26777886f6b5c2d20f4ec6627639110a_elex_wannacry.exe
Size 39KB
Sample261013-cqf4wayzcs
SHA256 1bb67cc9baafc954ba2c6875039751c9384671ec06d7e3539e842900fdb6d198
MD5 26777886f6b5c2d20f4ec6627639110a
SHA1 7f6d9cf779fa70dd72dd13b10bb3444b989f6783
SHA512 05082b13ec0ea8fddcf08a6a86f3ca8d05eab82c5326aae99372d3cdea5361d85e328a721a42b6de14a42c45871a10dd4088187a83c06b47b85d48c5a60b0ed9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBH:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T10B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
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/3720-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0006000000019f1c-4.dat	family_juko
behavioral2/memory/3720-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4792-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001100000001c459-13.dat	family_juko
behavioral2/memory/1824-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1824-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4792	WINWORD.exe
1824	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-1-5-21-4154726816-2055034831-2297277433-1000\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
5108	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-11_26777886f6b5c2d20f4ec6627639110a_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
2756	PING.EXE
5956	PING.EXE
5108	cmd.exe
3640	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3640	PING.EXE
2756	PING.EXE
5956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3720 wrote to memory of 4792	3720	2026-10-11_26777886f6b5c2d20f4ec6627639110a_elex_wannacry.exe	89
PID 4792 wrote to memory of 5108	4792	WINWORD.exe	90
PID 5108 wrote to memory of 3640	5108	cmd.exe	92
PID 5108 wrote to memory of 2756	5108	cmd.exe	93
PID 5108 wrote to memory of 5956	5108	cmd.exe	94
PID 5108 wrote to memory of 1824	5108	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-11_26777886f6b5c2d20f4ec6627639110a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-11_26777886f6b5c2d20f4ec6627639110a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3720
- 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:4792
- - 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\00003522" 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:5108
  - - 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:3640
  - - 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:2756
  - - 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:5956
  - - 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:1824

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

00003522

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003522
Size 39KB
SHA256 e21c70f015c30c10d194372d97abeba7d563af5113ab1468482eabd10d7576f4
MD5 7fdbd5fc4c3234fc424d41544564e5f4
SHA1 77e8d8fc27d0ccb5f46607dfb8a05f411144636f
SHA512 be0327a0e85f2c80ab11e02badc7d0e29d52db0a454e214f7f6763e4fdb5a102927e31f93e21a71b5e6ff7600b79c776f9fc45f5794a6477fab320db56c9a950
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBq:aLsF2Kerc64sTiX2IV0DVyIGFZ
TLSH
T19F036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 1bb67cc9baafc954ba2c6875039751c9384671ec06d7e3539e842900fdb6d198
MD5 26777886f6b5c2d20f4ec6627639110a
SHA1 7f6d9cf779fa70dd72dd13b10bb3444b989f6783
SHA512 05082b13ec0ea8fddcf08a6a86f3ca8d05eab82c5326aae99372d3cdea5361d85e328a721a42b6de14a42c45871a10dd4088187a83c06b47b85d48c5a60b0ed9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBH:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T10B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1824-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1824-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3720-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3720-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4792-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads