juko | 67fd8f6449e7bdb135101cec7108681798060bad7ebd8e1d09435ae720681b6e

General

Target
2026-09-30_80a0b838e7aac90a203363d85df40c5b_elex_wannacry.exe
Size 67KB
Sample260930-l5f7vsv1cx
SHA256 67fd8f6449e7bdb135101cec7108681798060bad7ebd8e1d09435ae720681b6e
MD5 80a0b838e7aac90a203363d85df40c5b
SHA1 6b3ad70944d5f0b331e30677427e38b891c88b2c
SHA512 e9de788b157f536236416395c83129fcf4ebc81973965fdbbb1fa0fc4ee5b80761394b998fc39d9513ab36cbe81d277747c86c8cf02471a4c99a0854f23a1a5b
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQW:aLy2Kerc64CiGImRylFyp8TV
TLSH
T14D633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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 6 IoCs

resource	yara_rule
behavioral2/memory/2948-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000700000001b857-5.dat	family_juko
behavioral2/memory/2948-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3252-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c59f-13.dat	family_juko
behavioral2/memory/2228-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3252	WINWORD.exe
2228	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-1-5-21-4154726816-2055034831-2297277433-1000\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
5008	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-30_80a0b838e7aac90a203363d85df40c5b_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

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
4240	PING.EXE
2216	PING.EXE
4156	PING.EXE
5008	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4240	PING.EXE
2216	PING.EXE
4156	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2948 wrote to memory of 3252	2948	2026-09-30_80a0b838e7aac90a203363d85df40c5b_elex_wannacry.exe	89
PID 3252 wrote to memory of 5008	3252	WINWORD.exe	90
PID 5008 wrote to memory of 4240	5008	cmd.exe	92
PID 5008 wrote to memory of 2216	5008	cmd.exe	93
PID 5008 wrote to memory of 4156	5008	cmd.exe	94
PID 5008 wrote to memory of 2228	5008	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-30_80a0b838e7aac90a203363d85df40c5b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-30_80a0b838e7aac90a203363d85df40c5b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2948
- 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:3252
- - 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\000030D6" 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:5008
  - - 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:4240
  - - 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:2216
  - - 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:4156
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2228

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000030D6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000030D6
Size 67KB
SHA256 a93843e5648d1162caaa1435257834f00ed0bfdf5b4c5bcf8dea434abcbf1a93
MD5 45234b2a0a2de3272482da77eeab38ca
SHA1 8d7f2afc540b1ea35f045878bc0076978ff4a772
SHA512 444cb0d9e17994e1faa2b235b7383179f879fc74bd51c8e8d50c443db253603ef48e2433f0ecf9c87f7ab0114c1da0a088530ee03a3c66f4fcffdfa38aaedad6
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQn:aLy2Kerc64CiGImRylFyp8Tc
TLSH
T1F4633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 67fd8f6449e7bdb135101cec7108681798060bad7ebd8e1d09435ae720681b6e
MD5 80a0b838e7aac90a203363d85df40c5b
SHA1 6b3ad70944d5f0b331e30677427e38b891c88b2c
SHA512 e9de788b157f536236416395c83129fcf4ebc81973965fdbbb1fa0fc4ee5b80761394b998fc39d9513ab36cbe81d277747c86c8cf02471a4c99a0854f23a1a5b
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQW:aLy2Kerc64CiGImRylFyp8TV
TLSH
T14D633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2228-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2948-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2948-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3252-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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