juko | 279d9365338065b1ed610fdbb584c783a535b242da1db198463bf2abc6e54de4

General

Target
2026-10-19_85d4f87b6d09a891cfd98e3dde79cab6_elex_wannacry.exe
Size 32KB
Sample261020-rs5btabh74
SHA256 279d9365338065b1ed610fdbb584c783a535b242da1db198463bf2abc6e54de4
MD5 85d4f87b6d09a891cfd98e3dde79cab6
SHA1 21081803b051b796346e44cf6e7f7cda9df41c63
SHA512 9c64326f884ae5b2bd1e59e7803be4d4b9219c917ac703d8b4770a1157df4aecc6e84f31c0940c491f9d4d52760e0511577df99b2c3f926733900993cf23bdb6
SSDEEP 768:xZL/0F24lercjO4sTZg5ZLvn2IuWZ0kquSNPWQH1x6:7LsF2Kerc64sTiX2IV0DuZuY
TLSH
T1E1E23B2B6AA17052C59320F0F9591F34C43E5DB9016BB062F7417B6928B6D63CF71ACE
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/0x001000000001b84a-3.dat	family_juko
behavioral2/files/0x000e00000001c5c4-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5228	WINWORD.exe
4528	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-1-5-21-2714045687-1127350534-2056456672-1000\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
5864	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	2026-10-19_85d4f87b6d09a891cfd98e3dde79cab6_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
5864	cmd.exe
4312	PING.EXE
1856	PING.EXE
5080	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4312	PING.EXE
1856	PING.EXE
5080	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 5228	2644	2026-10-19_85d4f87b6d09a891cfd98e3dde79cab6_elex_wannacry.exe	90
PID 5228 wrote to memory of 5864	5228	WINWORD.exe	91
PID 5864 wrote to memory of 4312	5864	cmd.exe	93
PID 5864 wrote to memory of 1856	5864	cmd.exe	94
PID 5864 wrote to memory of 5080	5864	cmd.exe	95
PID 5864 wrote to memory of 4528	5864	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-19_85d4f87b6d09a891cfd98e3dde79cab6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_85d4f87b6d09a891cfd98e3dde79cab6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2644
- 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:5228
- - 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\0000318C" 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:5864
  - - 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:4312
  - - 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:1856
  - - 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:5080
  - - 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:4528

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

0000318C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000318C
Size 32KB
SHA256 ee8fa0b8296344f3c2b6d2ab22f91e319937c0794050bbe10de37f1a6c85c99e
MD5 6044680ed121fbeacde45116032f19bb
SHA1 720450e81b7dc8321445f58d7b5c9a926cda79e6
SHA512 ec9fe7d7d9754529ae1a02fd66452af2ea6296751cbc7e220f955d593bfebf7b87382d75f4e1351800639a5ee87c645707291b9c29880cb33ac4428ae3ee12c7
SSDEEP 768:xZL/0F24lercjO4sTZg5ZLvn2IuWZ0kquSNPWQH1xE:7LsF2Kerc64sTiX2IV0DuZue
TLSH
T1C5E23B2B2AA17052C59320F0F9591F34C43E5DB9016BB0A2F7417B6928B6D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 279d9365338065b1ed610fdbb584c783a535b242da1db198463bf2abc6e54de4
MD5 85d4f87b6d09a891cfd98e3dde79cab6
SHA1 21081803b051b796346e44cf6e7f7cda9df41c63
SHA512 9c64326f884ae5b2bd1e59e7803be4d4b9219c917ac703d8b4770a1157df4aecc6e84f31c0940c491f9d4d52760e0511577df99b2c3f926733900993cf23bdb6
SSDEEP 768:xZL/0F24lercjO4sTZg5ZLvn2IuWZ0kquSNPWQH1x6:7LsF2Kerc64sTiX2IV0DuZuY
TLSH
T1E1E23B2B6AA17052C59320F0F9591F34C43E5DB9016BB062F7417B6928B6D63CF71ACE
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