juko | 7119f8a0748302b7deaf643c1ee5c39db0db430501a20029a2e1f8abb48d9e5b

General

Target
2026-10-18_934578f0aaa0904f1a86fc28b8d908be_elex_wannacry.exe
Size 86KB
Sample261018-nb8fcsysdt
SHA256 7119f8a0748302b7deaf643c1ee5c39db0db430501a20029a2e1f8abb48d9e5b
MD5 934578f0aaa0904f1a86fc28b8d908be
SHA1 7b53cc2aef19527500b60b3f33870fb7c4b403af
SHA512 a485579160feb3c5d8143ed1bdcf61531b66310669fc04993a867aaac94a4d74d9de4e77cfaea7561c11c0b06ea25fa4b7fdb139e7c2a9eded8caf27430ad482
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpN:vLy2Kerc64CiGImMPu/ouEQkwpN
TLSH
T17283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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/6112-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x00180000000115f6-4.dat	family_juko
behavioral2/memory/6112-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1336-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5de-13.dat	family_juko
behavioral2/memory/6044-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/6044-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1336	WINWORD.exe
6044	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
2580	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	2026-10-18_934578f0aaa0904f1a86fc28b8d908be_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
2580	cmd.exe
1956	PING.EXE
2560	PING.EXE
4532	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1956	PING.EXE
2560	PING.EXE
4532	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6112 wrote to memory of 1336	6112	2026-10-18_934578f0aaa0904f1a86fc28b8d908be_elex_wannacry.exe	88
PID 1336 wrote to memory of 2580	1336	WINWORD.exe	89
PID 2580 wrote to memory of 1956	2580	cmd.exe	91
PID 2580 wrote to memory of 2560	2580	cmd.exe	92
PID 2580 wrote to memory of 4532	2580	cmd.exe	93
PID 2580 wrote to memory of 6044	2580	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-18_934578f0aaa0904f1a86fc28b8d908be_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-18_934578f0aaa0904f1a86fc28b8d908be_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6112
- 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:1336
- - 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\00005A56" 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:2580
  - - 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:1956
  - - 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:2560
  - - 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:4532
  - - 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:6044

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

00005A56

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005A56
Size 86KB
SHA256 d28288e9fd00e15b78a714ed6057c527031e524b292f178edfadb85f6ec8c0de
MD5 db81c279feb88b316d688a56471553bc
SHA1 daeb3d7b8993ad8640dc16f7c23f8d6b3f64f3a0
SHA512 d9ae053f7ac636b588833f6c783b4aaf52cc8ac761b0c58dac94da89c05183148cfcfeaef64a015235dbe49f14cdb7ee2eb39116d2a8a2ff43fb5de55913d010
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpS:vLy2Kerc64CiGImMPu/ouEQkwpS
TLSH
T17483C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 7119f8a0748302b7deaf643c1ee5c39db0db430501a20029a2e1f8abb48d9e5b
MD5 934578f0aaa0904f1a86fc28b8d908be
SHA1 7b53cc2aef19527500b60b3f33870fb7c4b403af
SHA512 a485579160feb3c5d8143ed1bdcf61531b66310669fc04993a867aaac94a4d74d9de4e77cfaea7561c11c0b06ea25fa4b7fdb139e7c2a9eded8caf27430ad482
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpN:vLy2Kerc64CiGImMPu/ouEQkwpN
TLSH
T17283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1336-12-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/6044-16-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/6044-17-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/6112-0-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/6112-10-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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