juko | 48c9472dbb2073a0192f846c4b9a1d8b1af78816504f702df07c56a7cedd5308

General

Target
2026-08-17_2cd8750a8a411c28a039d5e29c5938e8_elex_wannacry.exe
Size 95KB
Sample260817-ct188assd1
SHA256 48c9472dbb2073a0192f846c4b9a1d8b1af78816504f702df07c56a7cedd5308
MD5 2cd8750a8a411c28a039d5e29c5938e8
SHA1 ace2c45c93ca57c4f15d047f14a81987b39c3b75
SHA512 634965303bb7d305c97ba1c177331d2ae497e7eda01205026c76484082b34900610a58997d6f792fdd7df6253302d4062dc9a3db0c66c89f335915cf0a9fba0c
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNM:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAo
TLSH
T1C693CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/5240-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000700000001b86d-5.dat	family_juko
behavioral2/memory/5240-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4180-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001000000001c489-13.dat	family_juko
behavioral2/memory/2804-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2804-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4180	WINWORD.exe
2804	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
4204	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	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	2026-08-17_2cd8750a8a411c28a039d5e29c5938e8_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4204	cmd.exe
4512	PING.EXE
5768	PING.EXE
3408	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5768	PING.EXE
3408	PING.EXE
4512	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5240 wrote to memory of 4180	5240	2026-08-17_2cd8750a8a411c28a039d5e29c5938e8_elex_wannacry.exe	89
PID 4180 wrote to memory of 4204	4180	WINWORD.exe	90
PID 4204 wrote to memory of 4512	4204	cmd.exe	92
PID 4204 wrote to memory of 5768	4204	cmd.exe	93
PID 4204 wrote to memory of 3408	4204	cmd.exe	94
PID 4204 wrote to memory of 2804	4204	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-17_2cd8750a8a411c28a039d5e29c5938e8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_2cd8750a8a411c28a039d5e29c5938e8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5240
- 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:4180
- - 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\00007779" 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:4204
  - - 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:4512
  - - 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:5768
  - - 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:3408
  - - 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:2804

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

00007779

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007779
Size 95KB
SHA256 5acedea6ed69e9260cef5bdae54e413ed86ca5b28b8c9784972d0ed55f190adb
MD5 f9033f5bd1fe90beb15a035d3194bddc
SHA1 95361d1e45c7352a9bc3999d66229e49dba43be2
SHA512 db7e0490ed6e2eda5ad8bed9bd17d14652e1fa2622d439f2b4cdc86c6f758d3b143ebb3957d330415bf24172574aaa979391364b30d6e1c9282a56dcfddd56a5
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNo:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAU
TLSH
T1E193CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 48c9472dbb2073a0192f846c4b9a1d8b1af78816504f702df07c56a7cedd5308
MD5 2cd8750a8a411c28a039d5e29c5938e8
SHA1 ace2c45c93ca57c4f15d047f14a81987b39c3b75
SHA512 634965303bb7d305c97ba1c177331d2ae497e7eda01205026c76484082b34900610a58997d6f792fdd7df6253302d4062dc9a3db0c66c89f335915cf0a9fba0c
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNM:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAo
TLSH
T1C693CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2804-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2804-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4180-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5240-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5240-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads