juko | 29c4d521cc5a126142ba80cc4c9fdaacf795b5ca3d061c12dde8cce3e06633f3

General

Target
2026-08-13_82c0f595d09eb6687ce6182760de26e2_elex_wannacry.exe
Size 87KB
Sample260813-sj8tbasfpd
SHA256 29c4d521cc5a126142ba80cc4c9fdaacf795b5ca3d061c12dde8cce3e06633f3
MD5 82c0f595d09eb6687ce6182760de26e2
SHA1 25a08e32031158244775fe14cc50659a63cecdc8
SHA512 7e81e6acc47c447bc4eb8f791b744b16ec214d37e0dd68f4aa2714dff40a3a8f1ec1270e4761fd37a1e5f7ad18bba6fec77c3903473bc173d2fdc7bf4ecec268
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp4:2Ly2Kerc64CiGIm1K851YO6EQkwp4
TLSH
T19893A1763A259190C48BD138E8155AA0B932DCF52FF75303E6417AAC59B1E13CFAE8C6
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/4784-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b1d0-5.dat	family_juko
behavioral2/memory/4784-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4156-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c554-13.dat	family_juko
behavioral2/memory/5360-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5360-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4156	WINWORD.exe
5360	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5312	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	2026-08-13_82c0f595d09eb6687ce6182760de26e2_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
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
5312	cmd.exe
3456	PING.EXE
1552	PING.EXE
2528	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3456	PING.EXE
1552	PING.EXE
2528	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4784 wrote to memory of 4156	4784	2026-08-13_82c0f595d09eb6687ce6182760de26e2_elex_wannacry.exe	89
PID 4156 wrote to memory of 5312	4156	WINWORD.exe	90
PID 5312 wrote to memory of 3456	5312	cmd.exe	92
PID 5312 wrote to memory of 1552	5312	cmd.exe	93
PID 5312 wrote to memory of 2528	5312	cmd.exe	94
PID 5312 wrote to memory of 5360	5312	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-13_82c0f595d09eb6687ce6182760de26e2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_82c0f595d09eb6687ce6182760de26e2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4784
- 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:4156
- - 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\0000584D" 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:5312
  - - 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:3456
  - - 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:1552
  - - 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:2528
  - - 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:5360

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

0000584D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000584D
Size 87KB
SHA256 fcec1cd3d5f0591162dfde4610d346b89bf3eb36086d713f8fa8d093579d8dc6
MD5 80b0d72308322d3931251eae29d6b1a8
SHA1 89191fa93fc6909db1ef13c83904fb1874e3ae90
SHA512 7bb74dca531c0dc1931e7cd9e55ce192d2d8da36a39ae74b1e519cf03487024165c4ffbce36cde2cc933e3edcdd9c762e8ff4150c8afe2df73e5dcf617e087f3
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpm:2Ly2Kerc64CiGIm1K851YO6EQkwpm
TLSH
T14E93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 29c4d521cc5a126142ba80cc4c9fdaacf795b5ca3d061c12dde8cce3e06633f3
MD5 82c0f595d09eb6687ce6182760de26e2
SHA1 25a08e32031158244775fe14cc50659a63cecdc8
SHA512 7e81e6acc47c447bc4eb8f791b744b16ec214d37e0dd68f4aa2714dff40a3a8f1ec1270e4761fd37a1e5f7ad18bba6fec77c3903473bc173d2fdc7bf4ecec268
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp4:2Ly2Kerc64CiGIm1K851YO6EQkwp4
TLSH
T19893A1763A259190C48BD138E8155AA0B932DCF52FF75303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4156-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4784-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4784-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5360-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5360-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads