juko | 821832d6386256d98273e6c5ca2b594847f6cb62a17f606c3f8adea5351ca1a6

General

Target
2026-08-10_86026f33181446982344b58facf8c98c_elex_wannacry.exe
Size 30KB
Sample260810-gxa9essekf
SHA256 821832d6386256d98273e6c5ca2b594847f6cb62a17f606c3f8adea5351ca1a6
MD5 86026f33181446982344b58facf8c98c
SHA1 d0ec46e300b8d66ae67c0c67225fe045d5fccfde
SHA512 51ab49faf64203b3d87e395f2dadcb5086aec45be661dfd6550d3c43ad4b227ca9acef4d9ee8daeb3782195e1cfca35b4279fbfc6894a2d5290c08334f552a17
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXu:tLsF2Kerc64sTiX2IV0Dzlou
TLSH
T110E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000900000001b884-4.dat	family_juko
behavioral2/files/0x001000000001c4e1-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3248	WINWORD.exe
4996	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-1-5-21-552508041-2681165170-3229858294-1000\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
4536	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_86026f33181446982344b58facf8c98c_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
4536	cmd.exe
1700	PING.EXE
3060	PING.EXE
2504	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1700	PING.EXE
3060	PING.EXE
2504	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5936 wrote to memory of 3248	5936	2026-08-10_86026f33181446982344b58facf8c98c_elex_wannacry.exe	89
PID 3248 wrote to memory of 4536	3248	WINWORD.exe	90
PID 4536 wrote to memory of 1700	4536	cmd.exe	92
PID 4536 wrote to memory of 3060	4536	cmd.exe	93
PID 4536 wrote to memory of 2504	4536	cmd.exe	94
PID 4536 wrote to memory of 4996	4536	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_86026f33181446982344b58facf8c98c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_86026f33181446982344b58facf8c98c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5936
- 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:3248
- - 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\0000112D" 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:4536
  - - 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:1700
  - - 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:3060
  - - 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:2504
  - - 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:4996

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

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Downloads

0000112D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000112D
Size 30KB
SHA256 35f4973b277afb65b4053e9d39c5d24137142aa54016057ff738c9f2358282c6
MD5 88c4576d65de432ccd3b3b6ed2b6c997
SHA1 320d4aab47fa804a1b333507792ee9f2721518fd
SHA512 6a669aa66eaff37171274acbae516589fefa59cbd94d1657c1197e72722bcd4a2b4ca3f05a33787c2b4514bfa5283779e2e7fa1d01f851e887b98989cf7d6588
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXq:tLsF2Kerc64sTiX2IV0Dzloq
TLSH
T1D5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 821832d6386256d98273e6c5ca2b594847f6cb62a17f606c3f8adea5351ca1a6
MD5 86026f33181446982344b58facf8c98c
SHA1 d0ec46e300b8d66ae67c0c67225fe045d5fccfde
SHA512 51ab49faf64203b3d87e395f2dadcb5086aec45be661dfd6550d3c43ad4b227ca9acef4d9ee8daeb3782195e1cfca35b4279fbfc6894a2d5290c08334f552a17
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXu:tLsF2Kerc64sTiX2IV0Dzlou
TLSH
T110E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads