juko | 2e40cfca4942832960b837272da7736449874429e0e2293565d6d0738eb37e1a

General

Target
2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe
Size 57KB
Sample260730-gp2fmsvsgs
SHA256 2e40cfca4942832960b837272da7736449874429e0e2293565d6d0738eb37e1a
MD5 0dc62f6db47590b6ce801b79dc1a0f5a
SHA1 6e05c7ede7d1a76696dbe34ee0220e6e3d9184cc
SHA512 46ad96863f84daae32cfef3a378fa2ddd6318c13b82d34fcda4e9ae56cb7da0fbe96f9cc7fec2b5743cf04f8e2ee9102649a82e97cde54a40e33920b940c24f5
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqab:wLy2Kerc64CiGImEsoDfab
TLSH
T192433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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/4340-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x001400000001b1d0-5.dat	family_juko
behavioral2/memory/4340-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/2552-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c551-13.dat	family_juko
behavioral2/memory/4296-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/4296-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2552	WINWORD.exe
4296	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
3264	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	2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_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
3264	cmd.exe
5716	PING.EXE
3428	PING.EXE
3544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5716	PING.EXE
3428	PING.EXE
3544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4340 wrote to memory of 2552	4340	2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe	88
PID 2552 wrote to memory of 3264	2552	WINWORD.exe	89
PID 3264 wrote to memory of 5716	3264	cmd.exe	91
PID 3264 wrote to memory of 3428	3264	cmd.exe	92
PID 3264 wrote to memory of 3544	3264	cmd.exe	93
PID 3264 wrote to memory of 4296	3264	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4340
- 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:2552
- - 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\000072C4" 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:3264
  - - 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:5716
  - - 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:3428
  - - 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:3544
  - - 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:4296

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

000072C4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000072C4
Size 57KB
SHA256 80c2152040b656745da1aaa4bd835f49e5b63db03c10018ea880a766f93bcff2
MD5 bbaa00fa7ce482a9239e074091b2e51e
SHA1 defb3d8183a22b5194034747d405f888b9d903f0
SHA512 92e96f1adb5e4099092c211ad573e5245ec3c0d80f81a781f2b75c474a0fa505ec0aec97fd91c66f30a7ed62dacaf35a5b093f838da428a41827dcc43803518b
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaI:wLy2Kerc64CiGImEsoDfaI
TLSH
T1F9433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 2e40cfca4942832960b837272da7736449874429e0e2293565d6d0738eb37e1a
MD5 0dc62f6db47590b6ce801b79dc1a0f5a
SHA1 6e05c7ede7d1a76696dbe34ee0220e6e3d9184cc
SHA512 46ad96863f84daae32cfef3a378fa2ddd6318c13b82d34fcda4e9ae56cb7da0fbe96f9cc7fec2b5743cf04f8e2ee9102649a82e97cde54a40e33920b940c24f5
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqab:wLy2Kerc64CiGImEsoDfab
TLSH
T192433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2552-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4296-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4296-16-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4340-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4340-9-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads