juko | 5bc77a793d655724a185043a1c4a7509e9e86aa75916a439fb436882cc438917

General

Target
2026-10-26_73d17ff080fa9b8593093c495744962f_elex_wannacry.exe
Size 49KB
Sample261027-rvxprasv2j
SHA256 5bc77a793d655724a185043a1c4a7509e9e86aa75916a439fb436882cc438917
MD5 73d17ff080fa9b8593093c495744962f
SHA1 74536a74114d9068fda7db6330b411815e5b6d56
SHA512 eacf9cb5a90546f61b35fa795baf2329a6f54f518424faa9715ceb7781cca7a976db30e87b059096c9032b11ee0830820d157a4cce46dffc1e168627519630ab
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:VLy2Kerc64CiGImVu8p4kojWh2D
TLSH
T1B1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4284-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b880-4.dat	family_juko
behavioral2/memory/4284-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4312-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c584-13.dat	family_juko
behavioral2/memory/5212-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5212-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4312	WINWORD.exe
5212	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
4980	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-26_73d17ff080fa9b8593093c495744962f_elex_wannacry.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
2512	PING.EXE
696	PING.EXE
4980	cmd.exe
916	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
916	PING.EXE
2512	PING.EXE
696	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4284 wrote to memory of 4312	4284	2026-10-26_73d17ff080fa9b8593093c495744962f_elex_wannacry.exe	90
PID 4312 wrote to memory of 4980	4312	WINWORD.exe	91
PID 4980 wrote to memory of 916	4980	cmd.exe	93
PID 4980 wrote to memory of 2512	4980	cmd.exe	94
PID 4980 wrote to memory of 696	4980	cmd.exe	95
PID 4980 wrote to memory of 5212	4980	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-26_73d17ff080fa9b8593093c495744962f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_73d17ff080fa9b8593093c495744962f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4284
- 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:4312
- - 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\00004B25" 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:4980
  - - 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:916
  - - 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:2512
  - - 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:696
  - - 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:5212

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

00004B25

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004B25
Size 49KB
SHA256 a19c8ee06c3c68b28c6ffae265acc96d3e09414ed173019fee5787dab4e9596a
MD5 febcd55cf5aa4aef2c72ca1c2892a5c2
SHA1 019a105fb1802b46308d71ce9d6bc4824a869cb4
SHA512 42e7584856faf93caeb4a06aba80bbc09069569098890b4477a36c4d54eee73eb8c6d46b7278e80b7801bd534c7fabc72f229f333dd6a356cbd6af639dfaccac
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2a:VLy2Kerc64CiGImVu8p4kojWh2a
TLSH
T159334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5bc77a793d655724a185043a1c4a7509e9e86aa75916a439fb436882cc438917
MD5 73d17ff080fa9b8593093c495744962f
SHA1 74536a74114d9068fda7db6330b411815e5b6d56
SHA512 eacf9cb5a90546f61b35fa795baf2329a6f54f518424faa9715ceb7781cca7a976db30e87b059096c9032b11ee0830820d157a4cce46dffc1e168627519630ab
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:VLy2Kerc64CiGImVu8p4kojWh2D
TLSH
T1B1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4284-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4284-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4312-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5212-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5212-17-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads