juko | 7144b00f913a5a4bc7f8246ec992db8fe08a87efab13b9d7b2d16b00a10d2d36

General

Target
2026-08-04_623d6e9854a387383cb311748f908222_elex_wannacry.exe
Size 49KB
Sample260805-a7bvdavcne
SHA256 7144b00f913a5a4bc7f8246ec992db8fe08a87efab13b9d7b2d16b00a10d2d36
MD5 623d6e9854a387383cb311748f908222
SHA1 d37c0804aacd5b4b623f405cd27a950d2b1eeb24
SHA512 cdf01936e8fb20f2f2437c8860fc7d376654084fb121dac227409e7ce913bdab026bac871ad86b70ec9f36e64275d72072ace2ca98f8f43d017c0fd7493e7934
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2b:VLy2Kerc64CiGImVucp4kojWh2b
TLSH
T14D334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
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/2312-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001b8ae-5.dat	family_juko
behavioral2/memory/2312-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3388-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4ca-13.dat	family_juko
behavioral2/memory/4492-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4492-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3388	WINWORD.exe
4492	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-1-5-21-3986082593-3624157295-3514260330-1000\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
1416	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	2026-08-04_623d6e9854a387383cb311748f908222_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
2660	PING.EXE
1232	PING.EXE
1416	cmd.exe
2320	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2320	PING.EXE
2660	PING.EXE
1232	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2312 wrote to memory of 3388	2312	2026-08-04_623d6e9854a387383cb311748f908222_elex_wannacry.exe	89
PID 3388 wrote to memory of 1416	3388	WINWORD.exe	90
PID 1416 wrote to memory of 2320	1416	cmd.exe	92
PID 1416 wrote to memory of 2660	1416	cmd.exe	93
PID 1416 wrote to memory of 1232	1416	cmd.exe	94
PID 1416 wrote to memory of 4492	1416	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_623d6e9854a387383cb311748f908222_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_623d6e9854a387383cb311748f908222_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2312
- 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:3388
- - 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\000048E9" 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:1416
  - - 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:2320
  - - 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:2660
  - - 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:1232
  - - 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:4492

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

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Downloads

000048E9

Path C:\Users\Admin\AppData\Roaming\Mozilla\000048E9
Size 49KB
SHA256 cafd014d3f8da9e1513f30d3fba57194895a7937305e25697244fcadc143c8eb
MD5 b59197613e09e4d6e4273dd6ea8fa719
SHA1 9695d29ccf1de43cf131a0a4fec8cfe7673f8f2b
SHA512 c9c172fc6092ec20343a0ddcf95725e57f23c7ccf80b0b4f3f8fcbcf6a5a57bdcc9f290468710d091d3dc087f5408e86c7901891e23b19322774dadba433b084
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2n:VLy2Kerc64CiGImVucp4kojWh2n
TLSH
T112334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 7144b00f913a5a4bc7f8246ec992db8fe08a87efab13b9d7b2d16b00a10d2d36
MD5 623d6e9854a387383cb311748f908222
SHA1 d37c0804aacd5b4b623f405cd27a950d2b1eeb24
SHA512 cdf01936e8fb20f2f2437c8860fc7d376654084fb121dac227409e7ce913bdab026bac871ad86b70ec9f36e64275d72072ace2ca98f8f43d017c0fd7493e7934
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2b:VLy2Kerc64CiGImVucp4kojWh2b
TLSH
T14D334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2312-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2312-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3388-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4492-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4492-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads