juko | 03968e9b27dc4c0fbf01f51c4a69338781f20dc54e063275f1f96dbd490af97b

General

Target
2026-08-01_1a85b01d111fc51eb972d478bccb998c_elex_wannacry.exe
Size 48KB
Sample260801-rm9pcack9s
SHA256 03968e9b27dc4c0fbf01f51c4a69338781f20dc54e063275f1f96dbd490af97b
MD5 1a85b01d111fc51eb972d478bccb998c
SHA1 69f51c46e93516b96fae2522cd4e2b1d9687cd51
SHA512 832878f5e22c590ff22eadc2c4114e8142eb7374d95da31c87a60321be93c2ed422b591b128207e61cf36a59335ad6b478db1888c4614268919f1652528a3cc1
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8i:bLy2Kerc64CiGImav42j0q
TLSH
T174234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/1100-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00070000000231d3-5.dat	family_juko
behavioral1/memory/1100-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/464-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000024445-15.dat	family_juko
behavioral1/memory/2316-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2316-18-0x0000000000400000-0x0000000000420000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-08-01_1a85b01d111fc51eb972d478bccb998c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
464	WINWORD.exe
2316	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-1-5-21-1074038928-2032447174-945360078-1000\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
1180	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	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	2026-08-01_1a85b01d111fc51eb972d478bccb998c_elex_wannacry.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
1180	cmd.exe
2232	PING.EXE
3964	PING.EXE
4724	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2232	PING.EXE
3964	PING.EXE
4724	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 464	1100	2026-08-01_1a85b01d111fc51eb972d478bccb998c_elex_wannacry.exe	86
PID 464 wrote to memory of 1180	464	WINWORD.exe	90
PID 1180 wrote to memory of 2232	1180	cmd.exe	92
PID 1180 wrote to memory of 3964	1180	cmd.exe	93
PID 1180 wrote to memory of 4724	1180	cmd.exe	94
PID 1180 wrote to memory of 2316	1180	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_1a85b01d111fc51eb972d478bccb998c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_1a85b01d111fc51eb972d478bccb998c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1100
- 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:464
- - 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\0000150C" 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:1180
  - - 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:2232
  - - 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:3964
  - - 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:4724
  - - 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:2316

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

0000150C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000150C
Size 48KB
SHA256 12c98ca864a4ce025f1420e6eefce8caa0299cb27869509ec2ab0bf29887b6dc
MD5 3fedea47fa59dd52679348f9bc4e09f8
SHA1 0df33994b4cc8a7c7a097c468669c1ca03d545ea
SHA512 abfa19bf563ee101ec0ed386b34db98b379815eb6cb56bdc96dbb814f38c9ad05ca1cd84fe5e7f0827d6cc589e7a31cb4cf7a491e95c22927bb69801912be099
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8G:bLy2Kerc64CiGImav42j0u
TLSH
T18C234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 03968e9b27dc4c0fbf01f51c4a69338781f20dc54e063275f1f96dbd490af97b
MD5 1a85b01d111fc51eb972d478bccb998c
SHA1 69f51c46e93516b96fae2522cd4e2b1d9687cd51
SHA512 832878f5e22c590ff22eadc2c4114e8142eb7374d95da31c87a60321be93c2ed422b591b128207e61cf36a59335ad6b478db1888c4614268919f1652528a3cc1
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8i:bLy2Kerc64CiGImav42j0q
TLSH
T174234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/464-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1100-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1100-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2316-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2316-18-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads