juko | 01ec37e63e56b3825e008bc945e9efc9ac1c9b6c8524bc63c2ef40adea9c0969

General

Target
2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe
Size 39KB
Sample260517-rdpb2sc18j
SHA256 01ec37e63e56b3825e008bc945e9efc9ac1c9b6c8524bc63c2ef40adea9c0969
MD5 b106e4d51ea41be0ba80dd1c2b5ebcee
SHA1 3754f45e442ae5d94b2f5a8746e5243c2bfddaea
SHA512 be5407b579a9f123685a7ee4998e38dfac0f5bf5eb27352387e7349d6f9d81b16b94c6bf8cf61c55c35346c4bdfa001d2fc3fa207877cde2c7e6bd4bffed88ac
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBh:aLsF2Kerc64sTiX2IV0DVyIGFC
TLSH
T1DF036B1B2964B062C69611B0F8696F34C03D9DB4052BF052F7447B992CB6DA3DF71ACE
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/3628-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b455-5.dat	family_juko
behavioral2/memory/3628-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/400-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b556-15.dat	family_juko
behavioral2/memory/2700-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2700-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
400	WINWORD.exe
2700	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-1-5-21-1679180529-4058988202-686829476-1000\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	2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_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
2352	cmd.exe
3540	PING.EXE
4752	PING.EXE
3240	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3540	PING.EXE
4752	PING.EXE
3240	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3628 wrote to memory of 400	3628	2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe	82
PID 400 wrote to memory of 2352	400	WINWORD.exe	83
PID 2352 wrote to memory of 3540	2352	cmd.exe	85
PID 2352 wrote to memory of 4752	2352	cmd.exe	86
PID 2352 wrote to memory of 3240	2352	cmd.exe	87
PID 2352 wrote to memory of 2700	2352	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3628
- 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:400
- - 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\00005029" 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:2352
  - - 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:3540
  - - 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:4752
  - - 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:3240
  - - 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:2700

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

00005029

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005029
Size 39KB
SHA256 45bf1a2ad4d2dee31c24579ced1740cb35755290833864a074d42f5a09c2b706
MD5 229ee559d020cdbbc2a68995bb0e4999
SHA1 e17d3dbe89e06bee9c38a1dbd714466feaaf235e
SHA512 85cdccf7a6fbc72710913d2de92784209c5e0baf4c979ee8f37c6c2615c5631fba11edb4b2c2c881997424641cd77fbf6a701ce2dd70ae3d25aea50ce8ad2c40
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBM:aLsF2Kerc64sTiX2IV0DVyIGFH
TLSH
T184036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 01ec37e63e56b3825e008bc945e9efc9ac1c9b6c8524bc63c2ef40adea9c0969
MD5 b106e4d51ea41be0ba80dd1c2b5ebcee
SHA1 3754f45e442ae5d94b2f5a8746e5243c2bfddaea
SHA512 be5407b579a9f123685a7ee4998e38dfac0f5bf5eb27352387e7349d6f9d81b16b94c6bf8cf61c55c35346c4bdfa001d2fc3fa207877cde2c7e6bd4bffed88ac
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBh:aLsF2Kerc64sTiX2IV0DVyIGFC
TLSH
T1DF036B1B2964B062C69611B0F8696F34C03D9DB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/400-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2700-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2700-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3628-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3628-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads