juko | 5786d73609b6e3317e17e7f3f464d1e86279b1f9788dfe228e2883f36b4c034c

General

Target
2026-08-07_2b003bbe30c55e134c161e8996f08ee5_elex_wannacry.exe
Size 49KB
Sample260807-mczn6swtbt
SHA256 5786d73609b6e3317e17e7f3f464d1e86279b1f9788dfe228e2883f36b4c034c
MD5 2b003bbe30c55e134c161e8996f08ee5
SHA1 8cb5ee4f3cea44e1a63be7defff946c4199796cd
SHA512 f7f12fb39ca91edca9d7acc5243e75c166c481947223a7793da1809b1b7d34ea73ccb194d1c79e59c1daee4ea067ae05a37bf8414c5af54564af6ce38dfc2da9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2b:VLy2Kerc64CiGImVucp4kojWh2b
TLSH
T158334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral2/memory/4516-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f000000019cbf-5.dat	family_juko
behavioral2/memory/4516-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3452-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c51d-13.dat	family_juko
behavioral2/memory/1236-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1236-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3452	WINWORD.exe
1236	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-1-5-21-189034102-168398478-1159367937-1000\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
5796	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	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	2026-08-07_2b003bbe30c55e134c161e8996f08ee5_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
1560	PING.EXE
4532	PING.EXE
5796	cmd.exe
3632	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3632	PING.EXE
1560	PING.EXE
4532	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4516 wrote to memory of 3452	4516	2026-08-07_2b003bbe30c55e134c161e8996f08ee5_elex_wannacry.exe	89
PID 3452 wrote to memory of 5796	3452	WINWORD.exe	90
PID 5796 wrote to memory of 3632	5796	cmd.exe	92
PID 5796 wrote to memory of 1560	5796	cmd.exe	93
PID 5796 wrote to memory of 4532	5796	cmd.exe	94
PID 5796 wrote to memory of 1236	5796	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-07_2b003bbe30c55e134c161e8996f08ee5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-07_2b003bbe30c55e134c161e8996f08ee5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4516
- 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:3452
- - 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\000000EC" 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:5796
  - - 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:3632
  - - 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:1560
  - - 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:4532
  - - 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:1236

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

000000EC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000000EC
Size 49KB
SHA256 26e691f3903713537568833f2dbe2df8f5bd54f33ccb7a0386ccc780bf3599c7
MD5 e5264846ebe952bda985a47d052f779e
SHA1 5819d8ce4b55c040f3abe264c734032c687f556c
SHA512 359014864129b06333fa4a95c6ea9d17aad8a3de2434b702c39e0b37ff5746bc56803269842c564b28e9e4631eec049a7471f45f7c2efaac95e62c62e3404cb4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2/:VLy2Kerc64CiGImVucp4kojWh2/
TLSH
T15B334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5786d73609b6e3317e17e7f3f464d1e86279b1f9788dfe228e2883f36b4c034c
MD5 2b003bbe30c55e134c161e8996f08ee5
SHA1 8cb5ee4f3cea44e1a63be7defff946c4199796cd
SHA512 f7f12fb39ca91edca9d7acc5243e75c166c481947223a7793da1809b1b7d34ea73ccb194d1c79e59c1daee4ea067ae05a37bf8414c5af54564af6ce38dfc2da9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2b:VLy2Kerc64CiGImVucp4kojWh2b
TLSH
T158334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1236-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1236-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3452-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4516-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4516-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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