juko | 5c1c6ba6fae3182a3b76d9ba0c47d46c28bc9778a606b7525f0002905a8b3fd6

General

Target
2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe
Size 64KB
Sample260831-d5hrpathkh
SHA256 5c1c6ba6fae3182a3b76d9ba0c47d46c28bc9778a606b7525f0002905a8b3fd6
MD5 d5c1570e34e55912582ab12ae05b9979
SHA1 8b96ba6fd4a41117b16c219704018b7e4a92dae8
SHA512 7448575e8663e043a93285cd52a4d3b386405dfd43b196987a573b6c40818f7dd7cc00e34036f72aeb2cfd89cc3b827a3685e5b72312fa5fc807d2966c69ebdb
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD9:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8V
TLSH
T1925338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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/0x000900000001b85a-3.dat	family_juko
behavioral2/files/0x000e00000001c575-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3460	WINWORD.exe
2732	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-1-5-21-3611646547-550105268-947503007-1000\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
5808	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	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	2026-08-30_d5c1570e34e55912582ab12ae05b9979_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
5808	cmd.exe
3140	PING.EXE
4576	PING.EXE
4156	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3140	PING.EXE
4576	PING.EXE
4156	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2880 wrote to memory of 3460	2880	2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe	89
PID 3460 wrote to memory of 5808	3460	WINWORD.exe	90
PID 5808 wrote to memory of 3140	5808	cmd.exe	92
PID 5808 wrote to memory of 4576	5808	cmd.exe	93
PID 5808 wrote to memory of 4156	5808	cmd.exe	94
PID 5808 wrote to memory of 2732	5808	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2880
- 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:3460
- - 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\00002824" 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:5808
  - - 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:3140
  - - 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:4576
  - - 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:4156
  - - 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:2732

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

00002824

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002824
Size 64KB
SHA256 f71e905b1c0aafabf86b5ca5bab1921030ca40326252084f7eec3c976236caf4
MD5 43f67c71c2ffdd141191cc3c85e9c74d
SHA1 4b36387b0bafc28dac4d5f6930bfdec97f771cb5
SHA512 03f1f52bbf71d5b3a23eff146f0b71406b9ad17c53318d93e73451d3c420656eca225ea6b0e6efe6b40364c2abe9654b45d3339e55b7f9118de4c802c7bb17f0
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD6:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8C
TLSH
T1C45338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 5c1c6ba6fae3182a3b76d9ba0c47d46c28bc9778a606b7525f0002905a8b3fd6
MD5 d5c1570e34e55912582ab12ae05b9979
SHA1 8b96ba6fd4a41117b16c219704018b7e4a92dae8
SHA512 7448575e8663e043a93285cd52a4d3b386405dfd43b196987a573b6c40818f7dd7cc00e34036f72aeb2cfd89cc3b827a3685e5b72312fa5fc807d2966c69ebdb
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD9:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8V
TLSH
T1925338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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