juko | 40878280db45f6e206bb07a2fcb5e57c21d41d2fed6e0a797a1d30fcd17739e3

General

Target
2026-06-26_d3f3e4c569693a4073039871fe368cd3_elex_wannacry.exe
Size 30KB
Sample260629-n7fp8aet7r
SHA256 40878280db45f6e206bb07a2fcb5e57c21d41d2fed6e0a797a1d30fcd17739e3
MD5 d3f3e4c569693a4073039871fe368cd3
SHA1 2d298f93e7fa95a344d1b81e620e5cdf63425b3b
SHA512 82d7e513137f2f1565adcf4d8ffc84f0eacc902231cfc7bc57035dfeffdb63af5722d9dc5e1352972b35001e1587f7520b953ebb728d99cd8f1d33aeb37689d8
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrH:OLsF2Kerc64sTiX2IV0DkFMH
TLSH
T14BE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D66DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x00170000000115a5-4.dat	family_juko
behavioral2/files/0x001200000001b84c-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6096	WINWORD.exe
3128	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-1-5-21-537605601-1362463912-856654178-1000\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

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	2026-06-26_d3f3e4c569693a4073039871fe368cd3_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
1584	cmd.exe
5448	PING.EXE
1708	PING.EXE
3676	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5448	PING.EXE
1708	PING.EXE
3676	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5280 wrote to memory of 6096	5280	2026-06-26_d3f3e4c569693a4073039871fe368cd3_elex_wannacry.exe	89
PID 6096 wrote to memory of 1584	6096	WINWORD.exe	90
PID 1584 wrote to memory of 5448	1584	cmd.exe	92
PID 1584 wrote to memory of 1708	1584	cmd.exe	93
PID 1584 wrote to memory of 3676	1584	cmd.exe	94
PID 1584 wrote to memory of 3128	1584	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-26_d3f3e4c569693a4073039871fe368cd3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-26_d3f3e4c569693a4073039871fe368cd3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5280
- 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:6096
- - 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\00005A49" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1584
  - - 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:5448
  - - 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:1708
  - - 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:3676
  - - 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:3128

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00005A49

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005A49
Size 30KB
SHA256 5511f295a64404669442494e4f32c9e1fb14f03e5e0def08df04f721c86a3c8b
MD5 77e523ad5c645e05a1bf2c63c2096286
SHA1 c408d4ea7613e9e2985910cf3cf507eba3ae871c
SHA512 64e208a8e13b8efeb5622ac31bac4a79a60d09db386002c47df67a62c386b50b3da458f1db3cdb37ea9be2d233b5ffc923f22c7273978b2a2b16faaaf84b4ebf
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrM:OLsF2Kerc64sTiX2IV0DkFMM
TLSH
T1DCE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D493CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 40878280db45f6e206bb07a2fcb5e57c21d41d2fed6e0a797a1d30fcd17739e3
MD5 d3f3e4c569693a4073039871fe368cd3
SHA1 2d298f93e7fa95a344d1b81e620e5cdf63425b3b
SHA512 82d7e513137f2f1565adcf4d8ffc84f0eacc902231cfc7bc57035dfeffdb63af5722d9dc5e1352972b35001e1587f7520b953ebb728d99cd8f1d33aeb37689d8
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrH:OLsF2Kerc64sTiX2IV0DkFMH
TLSH
T14BE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D66DAB1E9E
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