juko | 9881704b26efaf6aa888afc6b18591ac07cd5f28f78a4f78f1f90f7c596a2522

General

Target
2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe
Size 39KB
Sample260502-jsmsrsfs2m
SHA256 9881704b26efaf6aa888afc6b18591ac07cd5f28f78a4f78f1f90f7c596a2522
MD5 a26cf8becbac3231e2b70fadb88de70e
SHA1 ca9ef9b7b3d2875d3c754beb10096a6f19cef279
SHA512 ea6abfeae8d6889b3925010545200c9fe7b36f514001be819439d4f6205e2d4098bc82ac28c2e27adb14ddc0c1895b1d0fdc9b7843861e468cd0ffb25480c8a9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T158036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2608-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001047e-5.dat	family_juko
behavioral2/memory/2608-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5044-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b42c-15.dat	family_juko
behavioral2/memory/1644-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1644-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5044	WINWORD.exe
1644	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-1-5-21-3119821332-640943685-2562343641-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-02_a26cf8becbac3231e2b70fadb88de70e_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

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
4664	PING.EXE
764	PING.EXE
3172	cmd.exe
2568	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2568	PING.EXE
4664	PING.EXE
764	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2608 wrote to memory of 5044	2608	2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe	79
PID 5044 wrote to memory of 3172	5044	WINWORD.exe	80
PID 3172 wrote to memory of 2568	3172	cmd.exe	82
PID 3172 wrote to memory of 4664	3172	cmd.exe	83
PID 3172 wrote to memory of 764	3172	cmd.exe	84
PID 3172 wrote to memory of 1644	3172	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2608
- 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:5044
- - 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\0000501E" 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:3172
  - - 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:2568
  - - 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:4664
  - - 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:764
  - - 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:1644

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

0000501E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000501E
Size 39KB
SHA256 177a2f4ae07dc0764cab6f85f04e750daf23b83d2f6728a013cfc36877ba0a2f
MD5 4de63583fb9b7570f86387c53182bb93
SHA1 b78fc937435599d8fde4e35fd82e01cf68e8fb9c
SHA512 93fa5bfb0d94baa47f76acf86b114a65f8efd4e0c68d6a78f3496167a9775a1da93501b783a35729f08c18df6ad3e02bf353ce7d74492e217f0fbb7be91b7258
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBC:aLsF2Kerc64sTiX2IV0DVyIGF9
TLSH
T163035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 9881704b26efaf6aa888afc6b18591ac07cd5f28f78a4f78f1f90f7c596a2522
MD5 a26cf8becbac3231e2b70fadb88de70e
SHA1 ca9ef9b7b3d2875d3c754beb10096a6f19cef279
SHA512 ea6abfeae8d6889b3925010545200c9fe7b36f514001be819439d4f6205e2d4098bc82ac28c2e27adb14ddc0c1895b1d0fdc9b7843861e468cd0ffb25480c8a9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T158036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1644-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1644-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2608-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2608-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5044-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads