juko | ac3a693d3c761ba44eb3fa4d055036250600e3bfeb43eb0124b238e255314b3f

General

Target
2026-08-10_438b626aafa54865c5bb297f2f2b701a_elex_wannacry.exe
Size 37KB
Sample260810-hcksssshla
SHA256 ac3a693d3c761ba44eb3fa4d055036250600e3bfeb43eb0124b238e255314b3f
MD5 438b626aafa54865c5bb297f2f2b701a
SHA1 419658fbfc643c072b21962ad07f632676fe3b81
SHA512 b4062733514c90468b2018be19e66abdeb352fbea0088ca1bd185352c3c3fa09fa635f98b8e44cacf1bf290eb1f107574f72316e333d6577d439904389b35672
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogw7
TLSH
T166035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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 8 IoCs

resource	yara_rule
behavioral2/memory/924-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5b6-5.dat	family_juko
behavioral2/memory/4780-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/924-11-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4780-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5b7-14.dat	family_juko
behavioral2/memory/3924-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3924-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4780	WINWORD.exe
3924	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-1-5-21-1079202589-886135813-2527035092-1000\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
6052	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	2026-08-10_438b626aafa54865c5bb297f2f2b701a_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
4704	PING.EXE
3932	PING.EXE
6052	cmd.exe
5616	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5616	PING.EXE
4704	PING.EXE
3932	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 924 wrote to memory of 4780	924	2026-08-10_438b626aafa54865c5bb297f2f2b701a_elex_wannacry.exe	89
PID 4780 wrote to memory of 6052	4780	WINWORD.exe	90
PID 6052 wrote to memory of 5616	6052	cmd.exe	92
PID 6052 wrote to memory of 4704	6052	cmd.exe	93
PID 6052 wrote to memory of 3932	6052	cmd.exe	94
PID 6052 wrote to memory of 3924	6052	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_438b626aafa54865c5bb297f2f2b701a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_438b626aafa54865c5bb297f2f2b701a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:924
- 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:4780
- - 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\00003BFE" 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:6052
  - - 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:5616
  - - 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:4704
  - - 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:3932
  - - 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:3924

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

00003BFE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BFE
Size 37KB
SHA256 fce2bd25650c4dc42620928074dfefc454473b9a866881c461d3b1ae1bbc7987
MD5 9faca487880a07d1c6882a46a1362f81
SHA1 0ba4ee913e33946cebd1bd91fea7ce158760705f
SHA512 69af9c37a31d6fe1ae04c3dbec78d470ad2dfa43b659ac5165745747bef671412be9987ae198c12a744d61078af6777f762bb8e71598514049da9f276a4263ff
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywav:3LsF2Kerc64sTiX2IV0DhuogwE
TLSH
T1DF035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 ac3a693d3c761ba44eb3fa4d055036250600e3bfeb43eb0124b238e255314b3f
MD5 438b626aafa54865c5bb297f2f2b701a
SHA1 419658fbfc643c072b21962ad07f632676fe3b81
SHA512 b4062733514c90468b2018be19e66abdeb352fbea0088ca1bd185352c3c3fa09fa635f98b8e44cacf1bf290eb1f107574f72316e333d6577d439904389b35672
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogw7
TLSH
T166035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/924-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/924-11-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3924-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3924-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4780-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4780-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads