juko | 9285dd89fdcd19ee7bdaf8b2428b9cd775eaefb7592d5ca0fe104222b01ab950

General

Target
2026-06-26_880f44e63132f785af9e3490e5c66d79_elex_wannacry.exe
Size 137KB
Sample260629-rm4hbshs2j
SHA256 9285dd89fdcd19ee7bdaf8b2428b9cd775eaefb7592d5ca0fe104222b01ab950
MD5 880f44e63132f785af9e3490e5c66d79
SHA1 ae5e182568d76f64900e6bdae2d5489aafd84f40
SHA512 0828b4337feb7a9120d4328b134ed186b8a8efdfebdbe5ecbe84fde80c4c89a0704bde1156161595ae4f66cf27817e1667dc3f19b0f31d982446422d2ad89b45
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgl:+Ly2Kwc64YIcYjIDLCSiDaQK
TLSH
T1D0D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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 7 IoCs

resource	yara_rule
behavioral2/memory/5056-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x00280000000116c5-5.dat	family_juko
behavioral2/memory/5056-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4856-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c668-13.dat	family_juko
behavioral2/memory/6140-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/6140-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4856	WINWORD.exe
6140	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-1-5-21-1935666426-3801330415-1166019131-1000\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	2026-06-26_880f44e63132f785af9e3490e5c66d79_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
3260	cmd.exe
5920	PING.EXE
5984	PING.EXE
7120	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
7120	PING.EXE
5920	PING.EXE
5984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5056 wrote to memory of 4856	5056	2026-06-26_880f44e63132f785af9e3490e5c66d79_elex_wannacry.exe	88
PID 4856 wrote to memory of 3260	4856	WINWORD.exe	89
PID 3260 wrote to memory of 5920	3260	cmd.exe	91
PID 3260 wrote to memory of 5984	3260	cmd.exe	92
PID 3260 wrote to memory of 7120	3260	cmd.exe	93
PID 3260 wrote to memory of 6140	3260	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-06-26_880f44e63132f785af9e3490e5c66d79_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-26_880f44e63132f785af9e3490e5c66d79_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5056
- 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:4856
- - 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\00003C84" 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:3260
  - - 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:5920
  - - 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:5984
  - - 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:7120
  - - 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:6140

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

00003C84

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003C84
Size 137KB
SHA256 2481634af846fab2bf91e92c08c9c0df87abcb1332aacb6e3b4dffecff801678
MD5 5ca3e2cfa91aa2923087dd09404b27fa
SHA1 31b3b7f12c7e332e06acb27c92d7d81344cf456b
SHA512 5cb954ace5114a04db1c042fdece7838c819af58170be9930061abc6a9c745dd96a3513a86dddbb51066ec0afb5bdfafc26dd32acf8f8fa5b95a099a75d7a5b3
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgR:+Ly2Kwc64YIcYjIDLCSiDaQO
TLSH
T1D8D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 137KB
SHA256 9285dd89fdcd19ee7bdaf8b2428b9cd775eaefb7592d5ca0fe104222b01ab950
MD5 880f44e63132f785af9e3490e5c66d79
SHA1 ae5e182568d76f64900e6bdae2d5489aafd84f40
SHA512 0828b4337feb7a9120d4328b134ed186b8a8efdfebdbe5ecbe84fde80c4c89a0704bde1156161595ae4f66cf27817e1667dc3f19b0f31d982446422d2ad89b45
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgl:+Ly2Kwc64YIcYjIDLCSiDaQK
TLSH
T1D0D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4856-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5056-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5056-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/6140-15-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/6140-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads