juko | 73d35dc8cba23d6a96000aa062908854e0d72af93833e69a10b14a0d9022d58c

General

Target
2026-04-16_09e866a409b19b59741c964293c25d2e_elex_wannacry.exe
Size 39KB
Sample260416-lp4yzsfs8s
SHA256 73d35dc8cba23d6a96000aa062908854e0d72af93833e69a10b14a0d9022d58c
MD5 09e866a409b19b59741c964293c25d2e
SHA1 5d5b9c84b4b61f560effcf0ad505a7a3bde4d166
SHA512 b2b9961f0e757d9e491490a9791cbd46653099057e5dd1ead78e627f5e371220a3b1f3da83b18ef2ededc04cee5ca036d4f18f64e20e2a992b7789186fce61c0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBy:aLsF2Kerc64sTiX2IV0DVyIGFN
TLSH
T12C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/5012-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001b00000002a117-5.dat	family_juko
behavioral2/memory/5012-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/960-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b39d-15.dat	family_juko
behavioral2/memory/4864-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4864-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
960	WINWORD.exe
4864	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-1-5-21-1456842261-3464001825-2855069093-1000\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	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	2026-04-16_09e866a409b19b59741c964293c25d2e_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

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
492	PING.EXE
1240	cmd.exe
2796	PING.EXE
2204	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2796	PING.EXE
2204	PING.EXE
492	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5012 wrote to memory of 960	5012	2026-04-16_09e866a409b19b59741c964293c25d2e_elex_wannacry.exe	79
PID 960 wrote to memory of 1240	960	WINWORD.exe	80
PID 1240 wrote to memory of 2796	1240	cmd.exe	82
PID 1240 wrote to memory of 2204	1240	cmd.exe	83
PID 1240 wrote to memory of 492	1240	cmd.exe	84
PID 1240 wrote to memory of 4864	1240	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-16_09e866a409b19b59741c964293c25d2e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_09e866a409b19b59741c964293c25d2e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5012
- 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:960
- - 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\00002A89" 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:1240
  - - 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:2796
  - - 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:2204
  - - 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:492
  - - 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:4864

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

Replay Monitor

Loading Replay Monitor...

Downloads

00002A89

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002A89
Size 39KB
SHA256 5c3c5a415939277a3b286268d911a80ea133ed0b55c9c8ece6c91a85e98bf2f5
MD5 0d8d7d9fa7a528250b8dd867f164b62d
SHA1 f03e16a22bb492488d292c07d4b01b39350fe38b
SHA512 4741b33f03054a32bc3817a78108e57dae01d7ab6d889bd4ad3be860b40fcbf6040e80c2dde82eacbc75ecd966fa7d251a7c33c7b9c8dea7b971ea7766b03e2c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBw:aLsF2Kerc64sTiX2IV0DVyIGFn
TLSH
T1AE036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 73d35dc8cba23d6a96000aa062908854e0d72af93833e69a10b14a0d9022d58c
MD5 09e866a409b19b59741c964293c25d2e
SHA1 5d5b9c84b4b61f560effcf0ad505a7a3bde4d166
SHA512 b2b9961f0e757d9e491490a9791cbd46653099057e5dd1ead78e627f5e371220a3b1f3da83b18ef2ededc04cee5ca036d4f18f64e20e2a992b7789186fce61c0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBy:aLsF2Kerc64sTiX2IV0DVyIGFN
TLSH
T12C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/960-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4864-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4864-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5012-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5012-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads