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
behavioral1/files/0x0007000000016917-4.dat	family_juko
behavioral1/files/0x00080000000242c0-12.dat	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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4956	WINWORD.exe
4640	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-1-5-21-889581200-2041691093-2048517887-1000\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
4736	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	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
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
4736	cmd.exe
2852	PING.EXE
4760	PING.EXE
4636	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2852	PING.EXE
4760	PING.EXE
4636	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4412 wrote to memory of 4956	4412	2026-08-01_fc449c0266e27d5e93233f22c3e4cba8_elex_wannacry.exe	87
PID 4956 wrote to memory of 4736	4956	WINWORD.exe	88
PID 4736 wrote to memory of 2852	4736	cmd.exe	90
PID 4736 wrote to memory of 4760	4736	cmd.exe	91
PID 4736 wrote to memory of 4636	4736	cmd.exe	93
PID 4736 wrote to memory of 4640	4736	cmd.exe	94

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4412
- 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:4956
- - 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\00001449" 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:4736
  - - 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:2852
  - - 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:4760
  - - 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:4636
  - - 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:4640

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00001449

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001449
Size 64KB
SHA256 0092df7de34b15fe0af28df0536cd2a010208b6164e79c65c19a62b621eaa906
MD5 3391c0497cbf9bd39119c5f295ae8395
SHA1 0dfcc887cd14691451d27f3699c9c8152b7d64d2
SHA512 a6f90fe617ab74d181a12b8a7d59763d8a9a9acdcc22b289836f88563a581eb5b514a466202fba29c4c11195881a301729fc4ce1c157ea99bf437b3df5c9e961
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ua:sLy2Kerc64CiGIm8so28a
TLSH
T159535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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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