juko | 15f9528bce518ba466e8b74e325bb918dc99d5d6832a159f3598de51109f1934

General

Target
2026-06-29_d85ed4d65293f945d300794c22b976b6_elex_wannacry.exe
Size 95KB
Sample260630-dccd7sc18x
SHA256 15f9528bce518ba466e8b74e325bb918dc99d5d6832a159f3598de51109f1934
MD5 d85ed4d65293f945d300794c22b976b6
SHA1 9df877f670cd0c456dabbb3ace2f71b30b8d094b
SHA512 e3cd708e05cdde38cfa84de6ca049547d6fea2e6e6c47444f6acac46dcc5ae2bfae2fd32ab51d49c333a1582250ba5732f7c679507869651e869ab37836cbd41
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNL:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAf
TLSH
T11893CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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 8 IoCs

resource	yara_rule
behavioral2/memory/3128-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000700000001b84b-5.dat	family_juko
behavioral2/memory/3128-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4912-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4912-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c5d0-14.dat	family_juko
behavioral2/memory/4284-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4284-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4912	WINWORD.exe
4284	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-1-5-21-3047816590-610495838-277027736-1000\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	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	2026-06-29_d85ed4d65293f945d300794c22b976b6_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

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
6124	cmd.exe
4928	PING.EXE
1460	PING.EXE
1208	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4928	PING.EXE
1460	PING.EXE
1208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3128 wrote to memory of 4912	3128	2026-06-29_d85ed4d65293f945d300794c22b976b6_elex_wannacry.exe	89
PID 4912 wrote to memory of 6124	4912	WINWORD.exe	90
PID 6124 wrote to memory of 4928	6124	cmd.exe	92
PID 6124 wrote to memory of 1460	6124	cmd.exe	93
PID 6124 wrote to memory of 1208	6124	cmd.exe	94
PID 6124 wrote to memory of 4284	6124	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-29_d85ed4d65293f945d300794c22b976b6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-29_d85ed4d65293f945d300794c22b976b6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3128
- 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:4912
- - 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\00007292" 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:6124
  - - 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:4928
  - - 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:1460
  - - 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:1208
  - - 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:4284

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

00007292

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007292
Size 95KB
SHA256 4b0f3a96538d562ba9fb99905e0173285ded7b09b7435c137a59a70c61a8afa4
MD5 37e07ab137426e1126dcc69db6fd8710
SHA1 db236b1f21a6fc2f6ce5910521f3e02091da1c69
SHA512 562c67715cac5882f54438fdae57cead1ede90abb06d0c8c8ab3408a825cd5a81bae14a8c3f196d951ea7ba4cb98fa42bfbcfa174d0f5594f36b4804b128672a
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNM:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAQ
TLSH
T1D493CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 15f9528bce518ba466e8b74e325bb918dc99d5d6832a159f3598de51109f1934
MD5 d85ed4d65293f945d300794c22b976b6
SHA1 9df877f670cd0c456dabbb3ace2f71b30b8d094b
SHA512 e3cd708e05cdde38cfa84de6ca049547d6fea2e6e6c47444f6acac46dcc5ae2bfae2fd32ab51d49c333a1582250ba5732f7c679507869651e869ab37836cbd41
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNL:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAf
TLSH
T11893CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3128-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3128-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4284-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4284-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4912-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4912-13-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads