juko | 40ac981ad465a0f39ef789004f44dd35a46d5ca8cbff388a2ca7757dce1dd3b0

General

Target
2026-09-13_f9093f459a39c385431d8015333d394b_elex_wannacry.exe
Size 48KB
Sample260913-j52gpathma
SHA256 40ac981ad465a0f39ef789004f44dd35a46d5ca8cbff388a2ca7757dce1dd3b0
MD5 f9093f459a39c385431d8015333d394b
SHA1 b8545b676b69fb0363cff0fefc921d5ff3424e3f
SHA512 93ddfb1ee8002733be76681afbcc014447c69dd116a2de7dd9ee07538b230ee3d8a7a044ea761d802080af2852c1a653c2a9c446bda4a4a89fb2be679cd8bb05
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8O:bLy2Kerc64CiGImav42j02
TLSH
T173234A2EB5A26068C55390B4E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
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
behavioral1/memory/2116-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b00000002429a-5.dat	family_juko
behavioral1/memory/2116-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1668-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000900000002437e-15.dat	family_juko
behavioral1/memory/2720-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2720-18-0x0000000000400000-0x0000000000420000-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-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	2026-09-13_f9093f459a39c385431d8015333d394b_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1668	WINWORD.exe
2720	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-1-5-21-240542094-4193773837-3211495583-1000\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
3308	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-13_f9093f459a39c385431d8015333d394b_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

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
3308	cmd.exe
4824	PING.EXE
1128	PING.EXE
1884	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1128	PING.EXE
1884	PING.EXE
4824	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2116 wrote to memory of 1668	2116	2026-09-13_f9093f459a39c385431d8015333d394b_elex_wannacry.exe	81
PID 1668 wrote to memory of 3308	1668	WINWORD.exe	82
PID 3308 wrote to memory of 4824	3308	cmd.exe	84
PID 3308 wrote to memory of 1128	3308	cmd.exe	85
PID 3308 wrote to memory of 1884	3308	cmd.exe	86
PID 3308 wrote to memory of 2720	3308	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-09-13_f9093f459a39c385431d8015333d394b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-13_f9093f459a39c385431d8015333d394b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2116
- 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:1668
- - 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\000064E4" 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:3308
  - - 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:4824
  - - 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:1128
  - - 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:1884
  - - 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:2720

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

000064E4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000064E4
Size 48KB
SHA256 4810207f38c7f1915d9ffac2e99ff519d726457f518a0db1e423cf263c1cecbb
MD5 65b885cd35818959406e4c8f55cffa07
SHA1 99a580123859c06ee0e807265a25b1f86bccfad7
SHA512 b83fc8f7fa80ad2540981b700c52f6f622474a410cc3bd0e41474c5b44dfe46246b525b70f600cf533c2f794e90cba81189827369e42f122698300f93d568113
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8P:bLy2Kerc64CiGImav42j0X
TLSH
T1FC234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 40ac981ad465a0f39ef789004f44dd35a46d5ca8cbff388a2ca7757dce1dd3b0
MD5 f9093f459a39c385431d8015333d394b
SHA1 b8545b676b69fb0363cff0fefc921d5ff3424e3f
SHA512 93ddfb1ee8002733be76681afbcc014447c69dd116a2de7dd9ee07538b230ee3d8a7a044ea761d802080af2852c1a653c2a9c446bda4a4a89fb2be679cd8bb05
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8O:bLy2Kerc64CiGImav42j02
TLSH
T173234A2EB5A26068C55390B4E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1668-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2116-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2116-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2720-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2720-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads