juko | a31882dae7c9076871184182ecc36a8333c97e39962993e85f3de0fb1fc9f096

General

Target
2026-07-17_ca2592c70010911ce8b2f2e2ee57dc60_elex_wannacry.exe
Size 61KB
Sample260718-cjjanacy4m
SHA256 a31882dae7c9076871184182ecc36a8333c97e39962993e85f3de0fb1fc9f096
MD5 ca2592c70010911ce8b2f2e2ee57dc60
SHA1 bde908b65cf98417e107aac8366d9fbe46198622
SHA512 9cf34b07b80ce716e74c940d5728cb5a7e43a2b560f43e89fdcf0541f6d725e90e030a7b0473b8f8dce0b11734615b3bce17f38455756857e74955be8495cb94
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQg:yLy2Kerc64CiGImVZuyp8TH
TLSH
T1F9532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/1208-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cc9-5.dat	family_juko
behavioral2/memory/1208-9-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4900-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c52a-13.dat	family_juko
behavioral2/memory/1876-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1876-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4900	WINWORD.exe
1876	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
6008	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	2026-07-17_ca2592c70010911ce8b2f2e2ee57dc60_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
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
6008	cmd.exe
2596	PING.EXE
4964	PING.EXE
3356	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2596	PING.EXE
4964	PING.EXE
3356	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1208 wrote to memory of 4900	1208	2026-07-17_ca2592c70010911ce8b2f2e2ee57dc60_elex_wannacry.exe	89
PID 4900 wrote to memory of 6008	4900	WINWORD.exe	90
PID 6008 wrote to memory of 2596	6008	cmd.exe	92
PID 6008 wrote to memory of 4964	6008	cmd.exe	93
PID 6008 wrote to memory of 3356	6008	cmd.exe	94
PID 6008 wrote to memory of 1876	6008	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-17_ca2592c70010911ce8b2f2e2ee57dc60_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-17_ca2592c70010911ce8b2f2e2ee57dc60_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1208
- 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:4900
- - 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\000032FB" 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:6008
  - - 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:2596
  - - 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:4964
  - - 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:3356
  - - 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:1876

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

000032FB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000032FB
Size 61KB
SHA256 1f0cd72894f69e5aed4b2c570cc4c5c6607042978a2bf3e0899eb4e95bf12c42
MD5 82fa5c3800a67870043ffee8dff5bf29
SHA1 e9ff5662dd2d6e996f330acc0a66bc2ab76da265
SHA512 f9f1cc68526a6e1c299e76e04383f3e97cd2081754c56a1209345b30553c0c6581a1f48bc23b49805ed22d7ff2e907ad6cb184de476ff641a0d9800272be1823
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQr:yLy2Kerc64CiGImVZuyp8T4
TLSH
T18A532C26B950B072D95220B06A6D6B36417A9DF10717A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 a31882dae7c9076871184182ecc36a8333c97e39962993e85f3de0fb1fc9f096
MD5 ca2592c70010911ce8b2f2e2ee57dc60
SHA1 bde908b65cf98417e107aac8366d9fbe46198622
SHA512 9cf34b07b80ce716e74c940d5728cb5a7e43a2b560f43e89fdcf0541f6d725e90e030a7b0473b8f8dce0b11734615b3bce17f38455756857e74955be8495cb94
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQg:yLy2Kerc64CiGImVZuyp8TH
TLSH
T1F9532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1208-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1208-9-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/1876-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1876-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4900-12-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads