juko | b1dfe57de082318d54b7853635c2377f51919ee4d81c8c7d63cd56ac4b27045a

General

Target
2026-06-01_5a3f53cabefb14e98d8b8e8cb3481ff6_elex_wannacry.exe
Size 88KB
Sample260601-w16basev7n
SHA256 b1dfe57de082318d54b7853635c2377f51919ee4d81c8c7d63cd56ac4b27045a
MD5 5a3f53cabefb14e98d8b8e8cb3481ff6
SHA1 a5fbd885e32e9ab320035a921222879e26188cdb
SHA512 915cdb83b3a84baa8df825f90258749f38e93efc96fe3b644b6547950a00f92d809b42dd551c85fbd7211397974650566585857971a99a742946b172a23e29ce
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:zLy2Kerc64CiGImHc/28wzCBlycJWeeG
TLSH
T1E6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4520-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000c00000002aead-5.dat	family_juko
behavioral2/memory/4520-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3212-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b44e-15.dat	family_juko
behavioral2/memory/1540-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1540-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3212	WINWORD.exe
1540	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-1-5-21-2654269261-3199571979-4291878722-1000\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	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	2026-06-01_5a3f53cabefb14e98d8b8e8cb3481ff6_elex_wannacry.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
636	PING.EXE
4692	cmd.exe
1068	PING.EXE
3776	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3776	PING.EXE
636	PING.EXE
1068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4520 wrote to memory of 3212	4520	2026-06-01_5a3f53cabefb14e98d8b8e8cb3481ff6_elex_wannacry.exe	81
PID 3212 wrote to memory of 4692	3212	WINWORD.exe	82
PID 4692 wrote to memory of 1068	4692	cmd.exe	84
PID 4692 wrote to memory of 3776	4692	cmd.exe	85
PID 4692 wrote to memory of 636	4692	cmd.exe	86
PID 4692 wrote to memory of 1540	4692	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-06-01_5a3f53cabefb14e98d8b8e8cb3481ff6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-01_5a3f53cabefb14e98d8b8e8cb3481ff6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4520
- 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:3212
- - 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\0000155E" 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:4692
  - - 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:1068
  - - 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:3776
  - - 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:636
  - - 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:1540

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

0000155E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000155E
Size 88KB
SHA256 8fc61399274d935cab49dd9cb247776f18ca9bfe97c966ddc700921d2fdaf04e
MD5 73a7a1cd910933613cc7b6e8073616b1
SHA1 94b6bf636bc6592c9a3af9f6b1e6a76d7e24f6e4
SHA512 b12899a297dfc12b73edf3efdfa13e483322c216defbadaac955cda1085905b60778c31ad291e3924caa6e2ad0481be85ac7eb65af8a3c75ab9348461731786c
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsc:zLy2Kerc64CiGImHc/28wzCBlycJWeeT
TLSH
T127933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 b1dfe57de082318d54b7853635c2377f51919ee4d81c8c7d63cd56ac4b27045a
MD5 5a3f53cabefb14e98d8b8e8cb3481ff6
SHA1 a5fbd885e32e9ab320035a921222879e26188cdb
SHA512 915cdb83b3a84baa8df825f90258749f38e93efc96fe3b644b6547950a00f92d809b42dd551c85fbd7211397974650566585857971a99a742946b172a23e29ce
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:zLy2Kerc64CiGImHc/28wzCBlycJWeeG
TLSH
T1E6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1540-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1540-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3212-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4520-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4520-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads