juko | 19eda5548c5d51d5152bb34e6579329fac014838f60c22a5bb18f1c77978a17e

General

Target
2026-08-09_827d00fc329b994bac2a765368bccf84_elex_wannacry.exe
Size 50KB
Sample260809-epgecszdra
SHA256 19eda5548c5d51d5152bb34e6579329fac014838f60c22a5bb18f1c77978a17e
MD5 827d00fc329b994bac2a765368bccf84
SHA1 8f44c957a2a056836d12fa821817cc00c934ae6b
SHA512 b581828b2b004c917b1fc132e3e77a2f92d87fd784a21cd9b7812af1b9870249f6df1f69eb284a5fcee73c1ac888cb53512f4a47df6ed745100e04043470087c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOq:tLsF2Kerc64sTiX2IV0DpL8SE9nYOq
TLSH
T1EC33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0009000000019ce0-4.dat	family_juko
behavioral2/files/0x000e00000001c549-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1496	WINWORD.exe
4180	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-1-5-21-552508041-2681165170-3229858294-1000\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
6040	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	2026-08-09_827d00fc329b994bac2a765368bccf84_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
6040	cmd.exe
4888	PING.EXE
3924	PING.EXE
3304	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4888	PING.EXE
3924	PING.EXE
3304	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5564 wrote to memory of 1496	5564	2026-08-09_827d00fc329b994bac2a765368bccf84_elex_wannacry.exe	89
PID 1496 wrote to memory of 6040	1496	WINWORD.exe	90
PID 6040 wrote to memory of 4888	6040	cmd.exe	92
PID 6040 wrote to memory of 3924	6040	cmd.exe	93
PID 6040 wrote to memory of 3304	6040	cmd.exe	94
PID 6040 wrote to memory of 4180	6040	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_827d00fc329b994bac2a765368bccf84_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_827d00fc329b994bac2a765368bccf84_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5564
- 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:1496
- - 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\00001978" 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:6040
  - - 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:4888
  - - 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:3924
  - - 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:3304
  - - 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:4180

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

00001978

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001978
Size 50KB
SHA256 e04b1efda8215412ccec48ca3ef632955c242c0dfd5d000f7b146f5b258a43b3
MD5 a059dc3db82e83583a6ea3dc459e2c3f
SHA1 425e31a8288f98d3d0953534380f0a856bbcab3a
SHA512 29db973382bbce4d72349753a59f3e55237fa9fe7038a1a514b1b1df7ed56bed176c6bbaa940f89cde1d6fb4936ce1a2248485daf1797052b3aecc8b62034a0b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO+:tLsF2Kerc64sTiX2IV0DpL8SE9nYO+
TLSH
T1B933291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 19eda5548c5d51d5152bb34e6579329fac014838f60c22a5bb18f1c77978a17e
MD5 827d00fc329b994bac2a765368bccf84
SHA1 8f44c957a2a056836d12fa821817cc00c934ae6b
SHA512 b581828b2b004c917b1fc132e3e77a2f92d87fd784a21cd9b7812af1b9870249f6df1f69eb284a5fcee73c1ac888cb53512f4a47df6ed745100e04043470087c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOq:tLsF2Kerc64sTiX2IV0DpL8SE9nYOq
TLSH
T1EC33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads