juko | 649dee7f29cb69f9bc8a8e709ef7dcb1e736090f4fafd47fa6c0966b31e4f861

General

Target
2026-08-08_ebeb0eea472d8338a87588313c281d4b_elex_wannacry.exe
Size 39KB
Sample260808-vl8bns1dkd
SHA256 649dee7f29cb69f9bc8a8e709ef7dcb1e736090f4fafd47fa6c0966b31e4f861
MD5 ebeb0eea472d8338a87588313c281d4b
SHA1 efc7765c619f81575c8295cac3eae92c0f963984
SHA512 b85d3e8930f7ab4d3ad314f02a3f18be3bb17f2c9198743fa040cf887c105068ecf87fca12e6aef2e74dcd644e5122a5169b9b20d9d287c51c2d7ca980f8fb37
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB0:aLsF2Kerc64sTiX2IV0DVyIGF7
TLSH
T1D6036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3316-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/3316-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4696-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/6120-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6120-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4696	WINWORD.exe
6120	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5592	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	2026-08-08_ebeb0eea472d8338a87588313c281d4b_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
4940	PING.EXE
5768	PING.EXE
3272	PING.EXE
5592	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3272	PING.EXE
4940	PING.EXE
5768	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3316 wrote to memory of 4696	3316	2026-08-08_ebeb0eea472d8338a87588313c281d4b_elex_wannacry.exe	89
PID 4696 wrote to memory of 5592	4696	WINWORD.exe	90
PID 5592 wrote to memory of 4940	5592	cmd.exe	92
PID 5592 wrote to memory of 5768	5592	cmd.exe	93
PID 5592 wrote to memory of 3272	5592	cmd.exe	94
PID 5592 wrote to memory of 6120	5592	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_ebeb0eea472d8338a87588313c281d4b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_ebeb0eea472d8338a87588313c281d4b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3316
- 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:4696
- - 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\0000451F" 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:5592
  - - 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:4940
  - - 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:5768
  - - 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:3272
  - - 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:6120

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

0000451F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000451F
Size 39KB
SHA256 17d43208ef3730f19a8b6f1fb2165d12c10c62e967a317bb54ee60e81d71728b
MD5 c7c4af1efe94b4a63243ac322078e3f8
SHA1 ec6918b115440ab11fc3b0bb86d04c5f44d7ed54
SHA512 749b97274bbd9f972692e411fa20c432e9d2c798f92c744f2d52ccc69e66247e618b2b4cc7d6c888a0c18cddb5c9f785754b543b8e7c0d89af8f2d54f12e7ea9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB5:aLsF2Kerc64sTiX2IV0DVyIGF2
TLSH
T1FA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 649dee7f29cb69f9bc8a8e709ef7dcb1e736090f4fafd47fa6c0966b31e4f861
MD5 ebeb0eea472d8338a87588313c281d4b
SHA1 efc7765c619f81575c8295cac3eae92c0f963984
SHA512 b85d3e8930f7ab4d3ad314f02a3f18be3bb17f2c9198743fa040cf887c105068ecf87fca12e6aef2e74dcd644e5122a5169b9b20d9d287c51c2d7ca980f8fb37
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB0:aLsF2Kerc64sTiX2IV0DVyIGF7
TLSH
T1D6036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3316-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3316-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4696-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6120-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6120-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads