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 7 IoCs

resource	yara_rule
behavioral2/memory/920-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x001300000001b681-4.dat	family_juko
behavioral2/memory/920-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/3324-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4cb-13.dat	family_juko
behavioral2/memory/4568-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/4568-17-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3324	WINWORD.exe
4568	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-1-5-21-4057491610-3392471755-192832105-1000\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
5056	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
5056	cmd.exe
4368	PING.EXE
2096	PING.EXE
2136	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4368	PING.EXE
2096	PING.EXE
2136	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 920 wrote to memory of 3324	920	2026-10-28_1266d127708dc2bd9f3225c22f28897a_elex_wannacry.exe	90
PID 3324 wrote to memory of 5056	3324	WINWORD.exe	91
PID 5056 wrote to memory of 4368	5056	cmd.exe	93
PID 5056 wrote to memory of 2096	5056	cmd.exe	94
PID 5056 wrote to memory of 2136	5056	cmd.exe	95
PID 5056 wrote to memory of 4568	5056	cmd.exe	96

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:920
- 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:3324
- - 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\00004C7E" 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: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:4368
  - - 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:2096
  - - 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:2136
  - - 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:4568

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

00004C7E

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004C7E
Size 35KB
SHA256 432cc24360f92e34f99f1975a5fa5fcfe216f7a2bc2c92500a01f54e83721d94
MD5 da9206366d0c26a45d8416b19b2145b5
SHA1 fd0995c8cb951cad899d57dc82eeba6dc8a6e0d5
SHA512 89f14af0fbb40e8fc06911c256da142e23e0c3cb69dfdbdefc2c04bf1d1ec4ddbf93459e805cb9aa95e0a22f1f64c55fdf9271d8dda26743c4c134091f6fb8a1
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/N7:vLsF2Kerc64sTiX2IV0DhuX/N7
TLSH
T10FF23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
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/920-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/920-10-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3324-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4568-16-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4568-17-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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