juko | b133de673e363090fb44fa11a5fe7968ffdb575438dbf5f47d9aadc4da7cc90f

General

Target
2026-10-06_9516b566542c6fa1ef45b4e270fa9cfc_elex_wannacry.exe
Size 42KB
Sample261007-261kwsxse1
SHA256 b133de673e363090fb44fa11a5fe7968ffdb575438dbf5f47d9aadc4da7cc90f
MD5 9516b566542c6fa1ef45b4e270fa9cfc
SHA1 70cfeaa59aa4c1a51e7c6ef73eb1139279ad13ff
SHA512 83aaaefbe01db5cfbd8cc15416a03ac9095906952c44aa1d1a14d3d0398989dddd5b89525b11a050f5697f24c4ce7d0f7fb300506f5cad1d74214134d2de294f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOl7:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOB
TLSH
T15E134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
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/0x000700000001b846-3.dat	family_juko
behavioral2/files/0x000e00000001c467-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2964	WINWORD.exe
6064	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-1-5-21-4280978039-528710165-233981602-1000\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
5256	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-06_9516b566542c6fa1ef45b4e270fa9cfc_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

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
5256	cmd.exe
3460	PING.EXE
3132	PING.EXE
2904	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3460	PING.EXE
3132	PING.EXE
2904	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4772 wrote to memory of 2964	4772	2026-10-06_9516b566542c6fa1ef45b4e270fa9cfc_elex_wannacry.exe	89
PID 2964 wrote to memory of 5256	2964	WINWORD.exe	90
PID 5256 wrote to memory of 3460	5256	cmd.exe	92
PID 5256 wrote to memory of 3132	5256	cmd.exe	93
PID 5256 wrote to memory of 2904	5256	cmd.exe	94
PID 5256 wrote to memory of 6064	5256	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-06_9516b566542c6fa1ef45b4e270fa9cfc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-06_9516b566542c6fa1ef45b4e270fa9cfc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4772
- 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:2964
- - 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\00000BCE" 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:5256
  - - 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:3460
  - - 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:3132
  - - 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:2904
  - - 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:6064

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

00000BCE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000BCE
Size 42KB
SHA256 a3585412c54b9f2d95e43ee08c65b214724196f285101d95fb267734f8949ae3
MD5 11a2ef051c6715b98c1c6e85e3ba3c8f
SHA1 ffb43d6c0c8e6d3619afb6472bfb152cc302e784
SHA512 cb88b3c5bf24e453201fcbd13a0dd2eeb2d79ddb344cae5c2555a853a9e540f31321fe8f30c659edc9dccaea509c0993a3cb2c864ca512497055da14c97f836f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOl4:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOO+
TLSH
T11A134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 b133de673e363090fb44fa11a5fe7968ffdb575438dbf5f47d9aadc4da7cc90f
MD5 9516b566542c6fa1ef45b4e270fa9cfc
SHA1 70cfeaa59aa4c1a51e7c6ef73eb1139279ad13ff
SHA512 83aaaefbe01db5cfbd8cc15416a03ac9095906952c44aa1d1a14d3d0398989dddd5b89525b11a050f5697f24c4ce7d0f7fb300506f5cad1d74214134d2de294f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOl7:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOB
TLSH
T15E134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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