juko | f499eb76f0a0b17545bbfee4cc8633caba10859f34b319fbef320ce2596de1d7

General

Target
2026-10-02_fdda14a105177af14de0331c0302ceec_elex_wannacry.exe
Size 32KB
Sample261002-1ewl7atdnf
SHA256 f499eb76f0a0b17545bbfee4cc8633caba10859f34b319fbef320ce2596de1d7
MD5 fdda14a105177af14de0331c0302ceec
SHA1 b7cf4b54b3066dc6d5bd1b534ebd08bba7e36b0d
SHA512 e2f1cd2e7dd8a66a6b37bed6a70c4419e980e27eb0064e4abf0f0cbc18632e3994e1b730f5695494d44c7db6f2dfd4b66b207d34cb1b46217ee6c37e91f328d3
SSDEEP 768:AUZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpd:AYLsF2Kerc64sTiX2IV0Dhud
TLSH
T16FE2293B2AA17052C59220B0F9991F348D7D4CB7116BB066FB417A6928B2D63CF70DDE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000700000001b85a-3.dat	family_juko
behavioral2/files/0x000e00000001c4b2-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2880	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-1-5-21-461973139-3212354679-1508698038-1000\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
5216	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	2026-10-02_fdda14a105177af14de0331c0302ceec_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
2548	PING.EXE
5216	cmd.exe
3332	PING.EXE
3540	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3332	PING.EXE
3540	PING.EXE
2548	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4632 wrote to memory of 2880	4632	2026-10-02_fdda14a105177af14de0331c0302ceec_elex_wannacry.exe	89
PID 2880 wrote to memory of 5216	2880	WINWORD.exe	90
PID 5216 wrote to memory of 3332	5216	cmd.exe	92
PID 5216 wrote to memory of 3540	5216	cmd.exe	93
PID 5216 wrote to memory of 2548	5216	cmd.exe	94
PID 5216 wrote to memory of 6120	5216	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-02_fdda14a105177af14de0331c0302ceec_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-02_fdda14a105177af14de0331c0302ceec_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4632
- 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:2880
- - 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\0000662B" 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:5216
  - - 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:3332
  - - 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:3540
  - - 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:2548
  - - 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:6120

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

Replay Monitor

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Downloads

0000662B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000662B
Size 32KB
SHA256 cae5808783a6d22518f3658cc0852b706108ab864d18805541f22c43d6ab7993
MD5 2b494953f32723760721069cf950dbdc
SHA1 7f2e37dc1ea7f06f7d82fd08502b06590bc1409a
SHA512 8b8a0eb7771570e44b5baac8a158bb19e847b905dfae42783f549f3aaf3ec3aca24c9ddf48f9f2f2766e4f819acb3cc0dadf999c8dcfeb2c8f673dc4db5cb822
SSDEEP 768:AUZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpQ:AYLsF2Kerc64sTiX2IV0DhuQ
TLSH
T16BE2293B2AA17052C59220B0F9991F348D7D4CB7116BB066FB417A6928B2D63CF70DDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 f499eb76f0a0b17545bbfee4cc8633caba10859f34b319fbef320ce2596de1d7
MD5 fdda14a105177af14de0331c0302ceec
SHA1 b7cf4b54b3066dc6d5bd1b534ebd08bba7e36b0d
SHA512 e2f1cd2e7dd8a66a6b37bed6a70c4419e980e27eb0064e4abf0f0cbc18632e3994e1b730f5695494d44c7db6f2dfd4b66b207d34cb1b46217ee6c37e91f328d3
SSDEEP 768:AUZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpd:AYLsF2Kerc64sTiX2IV0Dhud
TLSH
T16FE2293B2AA17052C59220B0F9991F348D7D4CB7116BB066FB417A6928B2D63CF70DDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads