juko | 9a8b447b1843934f5c8374fc5c1c5fa265bc364348b8ce15024bab4c339a4c18

General

Target
2026-07-27_8a1caa637daa9ec01072e20725bb4b22_elex_wannacry.exe
Size 87KB
Sample260727-j5n7csaa68
SHA256 9a8b447b1843934f5c8374fc5c1c5fa265bc364348b8ce15024bab4c339a4c18
MD5 8a1caa637daa9ec01072e20725bb4b22
SHA1 d92006a14bc21700c44676de25079fecd7ae8107
SHA512 75056330be645f494bb553830b15d3c51a641c873f60e15dc35471d3dd5bf3f2c782a6206f4ee06528986d1222e0e0909b0574fe613bf97dc7e6d5a9139a7969
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpA:2Ly2Kerc64CiGIm1K851YO6EQkwpA
TLSH
T14993A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/5836-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001700000001c485-5.dat	family_juko
behavioral2/memory/5836-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4952-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5af-13.dat	family_juko
behavioral2/memory/1756-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1756-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4952	WINWORD.exe
1756	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
5276	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-27_8a1caa637daa9ec01072e20725bb4b22_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

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
5276	cmd.exe
4224	PING.EXE
4504	PING.EXE
2640	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4224	PING.EXE
4504	PING.EXE
2640	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5836 wrote to memory of 4952	5836	2026-07-27_8a1caa637daa9ec01072e20725bb4b22_elex_wannacry.exe	89
PID 4952 wrote to memory of 5276	4952	WINWORD.exe	90
PID 5276 wrote to memory of 4224	5276	cmd.exe	92
PID 5276 wrote to memory of 4504	5276	cmd.exe	93
PID 5276 wrote to memory of 2640	5276	cmd.exe	94
PID 5276 wrote to memory of 1756	5276	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_8a1caa637daa9ec01072e20725bb4b22_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_8a1caa637daa9ec01072e20725bb4b22_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5836
- 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:4952
- - 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\000036E3" 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:5276
  - - 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:4224
  - - 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:4504
  - - 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:2640
  - - 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:1756

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

000036E3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000036E3
Size 87KB
SHA256 0e8532bbc35de0472c75f04f2b1f8dc01ce98c33e41c194d87b9ac643d2c7e14
MD5 5d31d31600f3e7a26890c34580fc60e8
SHA1 75c7bf0c6ae0c32220f62127e3f1e96fdaa07830
SHA512 07a9518299d37b111b9608e984f498aca1165cd27a85464b8427bfc49b7ec1d2fd2cffc1f6d9b1fcb1a5f2f85f96b6d948bce27ecee7faef7c09963cabd88e6f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpu:2Ly2Kerc64CiGIm1K851YO6EQkwpu
TLSH
T1C593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 9a8b447b1843934f5c8374fc5c1c5fa265bc364348b8ce15024bab4c339a4c18
MD5 8a1caa637daa9ec01072e20725bb4b22
SHA1 d92006a14bc21700c44676de25079fecd7ae8107
SHA512 75056330be645f494bb553830b15d3c51a641c873f60e15dc35471d3dd5bf3f2c782a6206f4ee06528986d1222e0e0909b0574fe613bf97dc7e6d5a9139a7969
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpA:2Ly2Kerc64CiGIm1K851YO6EQkwpA
TLSH
T14993A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1756-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1756-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4952-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5836-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5836-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads