juko | 1997b60acd5a3723d969040fc12404b4ef41b10ce74340cb9d6a564773962fad

General

Target
2026-07-20_44ff1d0cbc61334cab85861d70f5fd3c_elex_wannacry.exe
Size 49KB
Sample260720-n1d8tabt3w
SHA256 1997b60acd5a3723d969040fc12404b4ef41b10ce74340cb9d6a564773962fad
MD5 44ff1d0cbc61334cab85861d70f5fd3c
SHA1 f60118a2c1184790448cf5ddc7fbf04a749a987c
SHA512 2f20291e8fda80e5071c62917056d362a8bf5e02b77eb46153742ca577e6be894c692399d4db9ea72956b9839ef6772d8bd3d4f61ee76a27ed1cd46f10f4c52f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2t:VLy2Kerc64CiGImVucp4kojWh2t
TLSH
T198334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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
behavioral2/memory/6048-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0008000000016cf1-5.dat	family_juko
behavioral2/memory/6048-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4184-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x002200000001c44a-13.dat	family_juko
behavioral2/memory/5592-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5592-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4184	WINWORD.exe
5592	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-1-5-21-189034102-168398478-1159367937-1000\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
5048	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	2026-07-20_44ff1d0cbc61334cab85861d70f5fd3c_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
5048	cmd.exe
4944	PING.EXE
4984	PING.EXE
4572	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4944	PING.EXE
4984	PING.EXE
4572	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6048 wrote to memory of 4184	6048	2026-07-20_44ff1d0cbc61334cab85861d70f5fd3c_elex_wannacry.exe	89
PID 4184 wrote to memory of 5048	4184	WINWORD.exe	90
PID 5048 wrote to memory of 4944	5048	cmd.exe	92
PID 5048 wrote to memory of 4984	5048	cmd.exe	93
PID 5048 wrote to memory of 4572	5048	cmd.exe	94
PID 5048 wrote to memory of 5592	5048	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_44ff1d0cbc61334cab85861d70f5fd3c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_44ff1d0cbc61334cab85861d70f5fd3c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6048
- 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:4184
- - 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\000006E4" 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:5048
  - - 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:4944
  - - 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:4984
  - - 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:4572
  - - 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:5592

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

Replay Monitor

Loading Replay Monitor...

Downloads

000006E4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000006E4
Size 49KB
SHA256 6dae7f6da69e541c551212bf5e9e6e2034a86676e819bbd9884edfd9153d2a39
MD5 93cbc42536af087b052769ad5d3b03c3
SHA1 2d027f4237ba57e82310856f0d0a78fcdee631f4
SHA512 14dcad395980592ad59f66c17ebdf3c0af2f29bedb1665d10589e12b515ed61d60696d4524bf2d408ed54ecee1d4e607795e55add869b8982c56fe2b4fcbec9b
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2V:VLy2Kerc64CiGImVucp4kojWh2V
TLSH
T10E334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1997b60acd5a3723d969040fc12404b4ef41b10ce74340cb9d6a564773962fad
MD5 44ff1d0cbc61334cab85861d70f5fd3c
SHA1 f60118a2c1184790448cf5ddc7fbf04a749a987c
SHA512 2f20291e8fda80e5071c62917056d362a8bf5e02b77eb46153742ca577e6be894c692399d4db9ea72956b9839ef6772d8bd3d4f61ee76a27ed1cd46f10f4c52f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2t:VLy2Kerc64CiGImVucp4kojWh2t
TLSH
T198334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4184-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5592-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5592-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6048-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6048-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads