juko | 5ad0da50a316e5aeeced37b4a341f50fd7eec00122c6406f2ebb66a222debca6

General

Target
2026-10-28_1266d127708dc2bd9f3225c22f28897a_elex_wannacry.exe
Size 35KB
Sample261030-l33m3sys8p
SHA256 5ad0da50a316e5aeeced37b4a341f50fd7eec00122c6406f2ebb66a222debca6
MD5 1266d127708dc2bd9f3225c22f28897a
SHA1 746d27fed313dffd60a6c3d7b23d0a25ad93661f
SHA512 e09cf51d5855d11aa19b2005e8b52e26d38917c87ce71a74aafaf53c1b46d0a31a1384a09323ee20898794bfebb3669e69d324eb4970c13a0e360bf16ee8923c
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/Nm:vLsF2Kerc64sTiX2IV0DhuX/Nm
TLSH
T1B3F23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
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 8 IoCs

resource	yara_rule
behavioral1/memory/2624-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x002c00000001b679-4.dat	family_juko
behavioral1/memory/3464-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/2624-13-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/3464-15-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x0009000000024447-16.dat	family_juko
behavioral1/memory/1976-19-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/1976-20-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	2026-10-28_1266d127708dc2bd9f3225c22f28897a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3464	WINWORD.exe
1976	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-1-5-21-2101206053-1414382737-268919432-1000\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
788	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	2026-10-28_1266d127708dc2bd9f3225c22f28897a_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
788	cmd.exe
732	PING.EXE
3052	PING.EXE
2068	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
732	PING.EXE
3052	PING.EXE
2068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2624 wrote to memory of 3464	2624	2026-10-28_1266d127708dc2bd9f3225c22f28897a_elex_wannacry.exe	83
PID 3464 wrote to memory of 788	3464	WINWORD.exe	84
PID 788 wrote to memory of 732	788	cmd.exe	86
PID 788 wrote to memory of 3052	788	cmd.exe	89
PID 788 wrote to memory of 2068	788	cmd.exe	92
PID 788 wrote to memory of 1976	788	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-10-28_1266d127708dc2bd9f3225c22f28897a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_1266d127708dc2bd9f3225c22f28897a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2624
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3464
- - 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\00006747" 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:788
  - - 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:732
  - - 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:3052
  - - 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:2068
  - - 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:1976

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00006747

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006747
Size 35KB
SHA256 c1ace47242a391e008f10280eaa729774e82c421e440232b26efcf5d18603dce
MD5 d5f9b3f6ca09d837906d9fbe3c3c6fc9
SHA1 7336e500d6c2d57950e45555a629429b4ec3a049
SHA512 4f07f940f887079d70f686e86f0f3fd8d8ee8c0eadf4c0cbc1abdfe2a37cab9138009fb85891f27330de4df1eec57fff456daa741074c390aecb0aa9c83c8392
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/NN:vLsF2Kerc64sTiX2IV0DhuX/NN
TLSH
T152F23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 35KB
SHA256 5ad0da50a316e5aeeced37b4a341f50fd7eec00122c6406f2ebb66a222debca6
MD5 1266d127708dc2bd9f3225c22f28897a
SHA1 746d27fed313dffd60a6c3d7b23d0a25ad93661f
SHA512 e09cf51d5855d11aa19b2005e8b52e26d38917c87ce71a74aafaf53c1b46d0a31a1384a09323ee20898794bfebb3669e69d324eb4970c13a0e360bf16ee8923c
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/Nm:vLsF2Kerc64sTiX2IV0DhuX/Nm
TLSH
T1B3F23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1976-19-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/1976-20-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/2624-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/2624-13-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3464-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3464-15-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads