juko | 46c5d7b7b1d8d807b045c4f8c0881f5ccb84556fa37de310685f20edff27fcde

General

Target
2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe
Size 49KB
Sample260817-ctsl3shb39
SHA256 46c5d7b7b1d8d807b045c4f8c0881f5ccb84556fa37de310685f20edff27fcde
MD5 2eff851c73f3a4ef27e95601e05943cf
SHA1 6f510611ba9dd2297e309895adadce4805240f0a
SHA512 87f629c1631593c11b1e3c9e5cc2ecdb197999ca9c950ee88b550868f7a8c6eac6399f55d299890185959b0860ee3a4736b063e3b95503adb7b94e2601eca952
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2p:VLy2Kerc64CiGImVucp4kojWh2p
TLSH
T174334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4844-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024597-5.dat	family_juko
behavioral1/memory/4844-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4052-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000800000002459f-15.dat	family_juko
behavioral1/memory/4712-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4712-18-0x0000000000400000-0x0000000000420000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4052	WINWORD.exe
4712	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-1-5-21-2937465464-4167303362-2236413517-1000\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
2760	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	2026-08-17_2eff851c73f3a4ef27e95601e05943cf_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
2760	cmd.exe
3452	PING.EXE
3224	PING.EXE
4232	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3452	PING.EXE
3224	PING.EXE
4232	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4844 wrote to memory of 4052	4844	2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe	83
PID 4052 wrote to memory of 2760	4052	WINWORD.exe	84
PID 2760 wrote to memory of 3452	2760	cmd.exe	86
PID 2760 wrote to memory of 3224	2760	cmd.exe	87
PID 2760 wrote to memory of 4232	2760	cmd.exe	88
PID 2760 wrote to memory of 4712	2760	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4844
- 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:4052
- - 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\00006237" 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:2760
  - - 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:3452
  - - 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:3224
  - - 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:4232
  - - 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:4712

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

Replay Monitor

Loading Replay Monitor...

Downloads

00006237

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006237
Size 49KB
SHA256 b32b5f3b78b6ef61ebcbe3b094cd19cefd1868b270825cd7f2f090da873eff2d
MD5 efe2673807c27644602f09c676b374ca
SHA1 6412432c1b4bb929fb8ff439517f0148655ceef5
SHA512 d6e5ceacc31650137b01e11a57fe6b014279ee893cc3031c6bfee3e0540a176e57276158f65af073432cc8ab8abf3b523cdd68d7cef7238460d8c18f55bd612d
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2o:VLy2Kerc64CiGImVucp4kojWh2o
TLSH
T1FA334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 46c5d7b7b1d8d807b045c4f8c0881f5ccb84556fa37de310685f20edff27fcde
MD5 2eff851c73f3a4ef27e95601e05943cf
SHA1 6f510611ba9dd2297e309895adadce4805240f0a
SHA512 87f629c1631593c11b1e3c9e5cc2ecdb197999ca9c950ee88b550868f7a8c6eac6399f55d299890185959b0860ee3a4736b063e3b95503adb7b94e2601eca952
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2p:VLy2Kerc64CiGImVucp4kojWh2p
TLSH
T174334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4052-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4712-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4712-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4844-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4844-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads