juko | a68928f4084b924ac769505bc81886736f592ff62ce795e7b68107ad271ab214

General

Target
2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe
Size 39KB
Sample260809-aptmgafl5w
SHA256 a68928f4084b924ac769505bc81886736f592ff62ce795e7b68107ad271ab214
MD5 09b2248d2b045f87c2e8ff6a9bb95bbd
SHA1 a61122e9ccbf1d2bc8b60f32acc8e2daa7b2ba94
SHA512 b091f3f24be185361288b2b57944987f44426666ca0a98bc2f948d4afa0da79e53882baa8a7bc2c2c168916ac3b8ee9016ea8e72d486cebc1f8d485116f696fe
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBy:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1AA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/5676-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b87d-5.dat	family_juko
behavioral2/memory/5676-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2972-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4c8-13.dat	family_juko
behavioral2/memory/2792-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2792-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2972	WINWORD.exe
2792	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-1-5-21-3797332335-34111092-3597280141-1000\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
4216	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	2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_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
4212	PING.EXE
3832	PING.EXE
3816	PING.EXE
4216	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3832	PING.EXE
3816	PING.EXE
4212	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5676 wrote to memory of 2972	5676	2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe	89
PID 2972 wrote to memory of 4216	2972	WINWORD.exe	90
PID 4216 wrote to memory of 4212	4216	cmd.exe	92
PID 4216 wrote to memory of 3832	4216	cmd.exe	93
PID 4216 wrote to memory of 3816	4216	cmd.exe	94
PID 4216 wrote to memory of 2792	4216	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5676
- 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:2972
- - 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\00004B39" 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:4216
  - - 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:4212
  - - 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:3832
  - - 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:3816
  - - 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:2792

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

Replay Monitor

Loading Replay Monitor...

Downloads

00004B39

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004B39
Size 39KB
SHA256 e56e415accbb089bdddcc317f550f0ddd9d63e74ba8dfc564d4cdb783b032111
MD5 16d26d4a9bf98779dc3932d82af0727c
SHA1 963e8e0614ab06482d78a62ed2a1e162219755f6
SHA512 ba1903567812a5f476773c08a18b4b2acd5c3dc656ab5820b9bd3c4c613fb6964e47d250f7a606521fd6899657746933a1d3ba2846dd115722fed187079aa45a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBW:aLsF2Kerc64sTiX2IV0DVyIGFZ
TLSH
T162036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 a68928f4084b924ac769505bc81886736f592ff62ce795e7b68107ad271ab214
MD5 09b2248d2b045f87c2e8ff6a9bb95bbd
SHA1 a61122e9ccbf1d2bc8b60f32acc8e2daa7b2ba94
SHA512 b091f3f24be185361288b2b57944987f44426666ca0a98bc2f948d4afa0da79e53882baa8a7bc2c2c168916ac3b8ee9016ea8e72d486cebc1f8d485116f696fe
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBy:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1AA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2792-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2792-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2972-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5676-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5676-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads