juko | 5e0445392f2125f09c87b911f26cc56808b0e5428189235e5f0084cdfb43bb70

General

Target
2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe
Size 117KB
Sample261018-ybcc2acd45
SHA256 5e0445392f2125f09c87b911f26cc56808b0e5428189235e5f0084cdfb43bb70
MD5 c6d5ac42a1f788de4759acaa56617afe
SHA1 a11c8ee2cc71c007f52f97aa29cbcb20dde26eb1
SHA512 ce3c3023879ca44ec43b82058dfdc23e94b99a59219a4d2cac46e4f1a26ae1b824a931896fa0061d33a32661986df41385df6e1492a504ccae64bc0c0b584fbd
SSDEEP 1536:oLsF2Kerc64sTiX2IV0DA1cr2jaFBZ0/v82:oLy2Kerc64CiGImU1m2j0u
TLSH
T1A0C34B2EB5A26068C55290B4E9EA3F31D4317C75012B752AA700BF252E76E23CF77D8D
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/3476-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b859-4.dat	family_juko
behavioral2/memory/3476-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5488-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c5c1-13.dat	family_juko
behavioral2/memory/2892-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2892-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5488	WINWORD.exe
2892	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-1-5-21-1704430598-3087477806-3297458608-1000\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
3604	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-17_c6d5ac42a1f788de4759acaa56617afe_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
3604	cmd.exe
2848	PING.EXE
3940	PING.EXE
1996	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2848	PING.EXE
3940	PING.EXE
1996	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3476 wrote to memory of 5488	3476	2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe	89
PID 5488 wrote to memory of 3604	5488	WINWORD.exe	90
PID 3604 wrote to memory of 2848	3604	cmd.exe	92
PID 3604 wrote to memory of 3940	3604	cmd.exe	93
PID 3604 wrote to memory of 1996	3604	cmd.exe	94
PID 3604 wrote to memory of 2892	3604	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3476
- 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:5488
- - 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\0000129C" 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:3604
  - - 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:2848
  - - 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:3940
  - - 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:1996
  - - 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:2892

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

0000129C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000129C
Size 117KB
SHA256 7cbad772fb61ed41eff2f93f79abdff1398366f25436df7077ae0484ab902adb
MD5 8bd11232a9c89df098719e5f760845c2
SHA1 3d80e1ae250ebde85ca603e29361cb85860c065f
SHA512 2550acca4b46660a1d3fcd882e14a53ca7db4b70616b27dccf251945ecf826c8b92925a118b1c122f24cc44fe6ad1ef04b5f8eecd30ef8d18737a5f0b2ef6b88
SSDEEP 1536:oLsF2Kerc64sTiX2IV0DA1cr2jaFBZ0/v8T:oLy2Kerc64CiGImU1m2j0L
TLSH
T187C34B2EB5A26068C55290B4E9EA3F31D4317C75012B752AA700BF252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 117KB
SHA256 5e0445392f2125f09c87b911f26cc56808b0e5428189235e5f0084cdfb43bb70
MD5 c6d5ac42a1f788de4759acaa56617afe
SHA1 a11c8ee2cc71c007f52f97aa29cbcb20dde26eb1
SHA512 ce3c3023879ca44ec43b82058dfdc23e94b99a59219a4d2cac46e4f1a26ae1b824a931896fa0061d33a32661986df41385df6e1492a504ccae64bc0c0b584fbd
SSDEEP 1536:oLsF2Kerc64sTiX2IV0DA1cr2jaFBZ0/v82:oLy2Kerc64CiGImU1m2j0u
TLSH
T1A0C34B2EB5A26068C55290B4E9EA3F31D4317C75012B752AA700BF252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2892-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2892-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3476-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3476-9-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5488-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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