juko | 63b7c9fea646dbae3f06974d0bbd1b74c0ae5b8f0f319cc0bfea72358c6dc9bd

General

Target
2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe
Size 48KB
Sample261030-bwl2msvx2q
SHA256 63b7c9fea646dbae3f06974d0bbd1b74c0ae5b8f0f319cc0bfea72358c6dc9bd
MD5 7a5f27ec26b6fcf2d36065cfed456b50
SHA1 956e6810dbab1b114d164dffd7315afe0065baed
SHA512 f28e197fa10928b879a7a70481692cc8673bdee1715d9ba32ef2d024373aa040867f3ec6023085480900feb380f552316e2547b2e779c298c2672fe14b5e4d46
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8d:bLy2Kerc64CiGImav42j0F
TLSH
T112234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/3520-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00080000000113bc-4.dat	family_juko
behavioral2/memory/3520-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5048-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000500000001b846-13.dat	family_juko
behavioral2/memory/4972-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4972-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5048	WINWORD.exe
4972	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-1-5-21-4280978039-528710165-233981602-1000\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
2792	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_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
2792	cmd.exe
5056	PING.EXE
4184	PING.EXE
1092	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4184	PING.EXE
1092	PING.EXE
5056	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3520 wrote to memory of 5048	3520	2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe	89
PID 5048 wrote to memory of 2792	5048	WINWORD.exe	90
PID 2792 wrote to memory of 5056	2792	cmd.exe	92
PID 2792 wrote to memory of 4184	2792	cmd.exe	93
PID 2792 wrote to memory of 1092	2792	cmd.exe	94
PID 2792 wrote to memory of 4972	2792	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_7a5f27ec26b6fcf2d36065cfed456b50_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3520
- 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:5048
- - 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\000077B5" 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:2792
  - - 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:5056
  - - 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:4184
  - - 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:1092
  - - 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:4972

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3028

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

000077B5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000077B5
Size 48KB
SHA256 c67f09f7aa86d9ac6d709f5dc8cbf90a79acc991db01e0eff939b76424815a3c
MD5 705b7e44cf5196bbd753dd1983c71721
SHA1 b013535a77e27346b30c7bfa136409c981257a6d
SHA512 6066242386f9ac706b0ce90f342a068a1d787c200f73d8b96f04973788884e03f881fdea402e14768febe02ee58c8ab17583cf3bc5b57241f7746bda005c8716
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8p:bLy2Kerc64CiGImav42j0x
TLSH
T149234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 63b7c9fea646dbae3f06974d0bbd1b74c0ae5b8f0f319cc0bfea72358c6dc9bd
MD5 7a5f27ec26b6fcf2d36065cfed456b50
SHA1 956e6810dbab1b114d164dffd7315afe0065baed
SHA512 f28e197fa10928b879a7a70481692cc8673bdee1715d9ba32ef2d024373aa040867f3ec6023085480900feb380f552316e2547b2e779c298c2672fe14b5e4d46
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8d:bLy2Kerc64CiGImav42j0F
TLSH
T112234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3520-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3520-9-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4972-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4972-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5048-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads