juko | 6e9c91a300568e5892c5ea018a77d6d076afb3626c3677ebdaf97f80401ba419

General

Target
2026-08-24_416598fded86b3dc7534d626439f53c9_elex_wannacry.exe
Size 39KB
Sample260825-r2sdlszzct
SHA256 6e9c91a300568e5892c5ea018a77d6d076afb3626c3677ebdaf97f80401ba419
MD5 416598fded86b3dc7534d626439f53c9
SHA1 50bbb619f19daec902615aa50d0c43c36c1a4e48
SHA512 4a593d94787e9a942e22f2dac6fbdd64778ea620e6b434f3b4e23ecac367dc5270793641c6bb0396fdaa3277a643565e0b8884e42ce6eb243435ebdeb8f3b9c7
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBG:aLsF2Kerc64sTiX2IV0DVyIGFV
TLSH
T180036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3292-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cb1-5.dat	family_juko
behavioral2/memory/3292-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3552-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c557-13.dat	family_juko
behavioral2/memory/1292-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1292-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3552	WINWORD.exe
1292	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
2608	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-24_416598fded86b3dc7534d626439f53c9_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

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
2096	PING.EXE
2936	PING.EXE
5640	PING.EXE
2608	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2096	PING.EXE
2936	PING.EXE
5640	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3292 wrote to memory of 3552	3292	2026-08-24_416598fded86b3dc7534d626439f53c9_elex_wannacry.exe	89
PID 3552 wrote to memory of 2608	3552	WINWORD.exe	90
PID 2608 wrote to memory of 2096	2608	cmd.exe	92
PID 2608 wrote to memory of 2936	2608	cmd.exe	93
PID 2608 wrote to memory of 5640	2608	cmd.exe	94
PID 2608 wrote to memory of 1292	2608	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_416598fded86b3dc7534d626439f53c9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_416598fded86b3dc7534d626439f53c9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3292
- 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:3552
- - 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\00003619" 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:2608
  - - 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:2096
  - - 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:2936
  - - 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:5640
  - - 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:1292

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

00003619

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003619
Size 39KB
SHA256 8687352bb3fe8f5eeb6ac01add934560645f96b1f91a22b351e9775f1e2b2dc9
MD5 fafadb72e2235e97dc8f3330acf6feab
SHA1 45e2087314d5a4024529478176a3dbad82e5b5ca
SHA512 a0b457ba17f870dbe05d5fb097743f064089ccb697b26f264fa6ac8138ffc0e85c77d676bf1a197b49ee28e525b075dc98f24c59f97cf4db812d7e3143cae596
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBs:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T14A036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 6e9c91a300568e5892c5ea018a77d6d076afb3626c3677ebdaf97f80401ba419
MD5 416598fded86b3dc7534d626439f53c9
SHA1 50bbb619f19daec902615aa50d0c43c36c1a4e48
SHA512 4a593d94787e9a942e22f2dac6fbdd64778ea620e6b434f3b4e23ecac367dc5270793641c6bb0396fdaa3277a643565e0b8884e42ce6eb243435ebdeb8f3b9c7
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBG:aLsF2Kerc64sTiX2IV0DVyIGFV
TLSH
T180036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1292-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1292-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3292-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3292-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3552-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads