juko | b76bf97b08f017e7e4ba1a033e92940a4c532c9f3caff8d7369c75f6d72881c2

General

Target
2026-08-01_f236ec9745329476c1768bef8eea14e4_elex_wannacry.exe
Size 64KB
Sample260801-pmv5vavfjd
SHA256 b76bf97b08f017e7e4ba1a033e92940a4c532c9f3caff8d7369c75f6d72881c2
MD5 f236ec9745329476c1768bef8eea14e4
SHA1 04e0bcee92ab66b2f3947e0d86b50f88c717f02c
SHA512 873a22ca0ffc9284c1729e15845a1f31895c9547b7ed839e4f57b496bfae6d76cf42e8d970920160b68e71fbf9b777058e8a57147bad07488e54bff8398163a4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uw:sLy2Kerc64CiGIm8so28w
TLSH
T1D4536C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x0008000000016cf1-4.dat	family_juko
behavioral2/files/0x001300000001c358-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6096	WINWORD.exe
1100	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-1-5-21-189034102-168398478-1159367937-1000\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
112	cmd.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_f236ec9745329476c1768bef8eea14e4_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

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
112	cmd.exe
952	PING.EXE
1496	PING.EXE
2120	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
952	PING.EXE
1496	PING.EXE
2120	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5496 wrote to memory of 6096	5496	2026-08-01_f236ec9745329476c1768bef8eea14e4_elex_wannacry.exe	89
PID 6096 wrote to memory of 112	6096	WINWORD.exe	90
PID 112 wrote to memory of 952	112	cmd.exe	92
PID 112 wrote to memory of 1496	112	cmd.exe	93
PID 112 wrote to memory of 2120	112	cmd.exe	94
PID 112 wrote to memory of 1100	112	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_f236ec9745329476c1768bef8eea14e4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_f236ec9745329476c1768bef8eea14e4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5496
- 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:6096
- - 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\00003457" 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:112
  - - 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:952
  - - 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:1496
  - - 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:2120
  - - 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
      System Location Discovery: System Language Discovery
      PID:1100

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003457

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003457
Size 64KB
SHA256 c8555d6dcd77904ba4762d87682f1a4fe96ff9b881aad939a85eb8dd4b40ef52
MD5 af84c57049dab960e560458f63e2b9cf
SHA1 61e0b5128609d661f570f7d8c9c4715bc03af9a4
SHA512 f4e5b2ecc627d7978986f8af7a499b8144a83a50f975a4ee0e0a2cc1d49c490b919057d813d238efd7d791d9e5fa552d7835ca4e79b0cea6a875b9e31e511fcc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uj:sLy2Kerc64CiGIm8so28j
TLSH
T10A535C2AA5A220F8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 b76bf97b08f017e7e4ba1a033e92940a4c532c9f3caff8d7369c75f6d72881c2
MD5 f236ec9745329476c1768bef8eea14e4
SHA1 04e0bcee92ab66b2f3947e0d86b50f88c717f02c
SHA512 873a22ca0ffc9284c1729e15845a1f31895c9547b7ed839e4f57b496bfae6d76cf42e8d970920160b68e71fbf9b777058e8a57147bad07488e54bff8398163a4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uw:sLy2Kerc64CiGIm8so28w
TLSH
T1D4536C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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