juko | f03cfe7deadd44d83e32b720fc3d8fc20bd572331011e75033ae0122aaff54e5

General

Target
2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_elex_wannacry.exe
Size 64KB
Sample260802-ecgvcsteqa
SHA256 f03cfe7deadd44d83e32b720fc3d8fc20bd572331011e75033ae0122aaff54e5
MD5 fc449c0266e27d5e93233f22c3e4cba8
SHA1 b58249ba5b3ed176738b595dffe5e67bf6f54c7f
SHA512 cb0c41ac2bf67a7c3630c520ccb3ba7834ca3069f5de898c50bc2bad780452224826666feff4734034cfdf587a12afb6f5b1456d3951d4ab1afd7a1aac97cade
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uE:sLy2Kerc64CiGIm8so28E
TLSH
T11D535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000b000000011371-4.dat	family_juko
behavioral2/files/0x000e00000001c5ed-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1108	WINWORD.exe
4676	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-1-5-21-4046655672-1449839301-2197395821-1000\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
4580	cmd.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	2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_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
4580	cmd.exe
4848	PING.EXE
2572	PING.EXE
4616	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2572	PING.EXE
4616	PING.EXE
4848	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3192 wrote to memory of 1108	3192	2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_elex_wannacry.exe	89
PID 1108 wrote to memory of 4580	1108	WINWORD.exe	90
PID 4580 wrote to memory of 4848	4580	cmd.exe	92
PID 4580 wrote to memory of 2572	4580	cmd.exe	93
PID 4580 wrote to memory of 4616	4580	cmd.exe	94
PID 4580 wrote to memory of 4676	4580	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3192
- 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:1108
- - 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\000040DA" 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:4580
  - - 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:4848
  - - 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:2572
  - - 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:4616
  - - 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
      System Location Discovery: System Language Discovery
      PID:4676

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:1176

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000040DA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040DA
Size 64KB
SHA256 f436a5f4d064a552bbf081aee3d3ecd30cbfd28aa5cc6a00046a8fd8034989b2
MD5 791b4e36e5ecb11d04cb700d50df0a59
SHA1 2f665a2f94d8668fbfe448dfa8bc6699a4dcc879
SHA512 a88af3599a12133302df8bb792fa926ad6503d97539a4add4503d11a08038ad91fb8880b393373186cae32b71324aed412e6baa04d3fcc28451c7583df81ec76
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uT:sLy2Kerc64CiGIm8so28T
TLSH
T1AC535C2AA5A220F8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 f03cfe7deadd44d83e32b720fc3d8fc20bd572331011e75033ae0122aaff54e5
MD5 fc449c0266e27d5e93233f22c3e4cba8
SHA1 b58249ba5b3ed176738b595dffe5e67bf6f54c7f
SHA512 cb0c41ac2bf67a7c3630c520ccb3ba7834ca3069f5de898c50bc2bad780452224826666feff4734034cfdf587a12afb6f5b1456d3951d4ab1afd7a1aac97cade
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uE:sLy2Kerc64CiGIm8so28E
TLSH
T11D535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads