juko | 1b012af6526fa5dab407d2bfb99910d0477e46eaa4e54620bef37a4baf123b74

General

Target
2026-07-30_b1e7ac290d395863da1536e1d10b729e_elex_wannacry.exe
Size 39KB
Sample260730-jmbhjstdjf
SHA256 1b012af6526fa5dab407d2bfb99910d0477e46eaa4e54620bef37a4baf123b74
MD5 b1e7ac290d395863da1536e1d10b729e
SHA1 a24fda42375db902b6ead7869c8b760007220569
SHA512 ed1caeddbf82e8d062e1b8b9b0bc43e08b808925a344de255212640b444e1df24405e751d20f2f5677e1ef51abbce0572dfa508a61eb0cffc8a71defc4344d4a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBb:aLsF2Kerc64sTiX2IV0DVyIGFw
TLSH
T1EB035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4836-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e000000019cb1-5.dat	family_juko
behavioral2/memory/4836-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2444-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b4-13.dat	family_juko
behavioral2/memory/1408-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1408-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2444	WINWORD.exe
1408	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
2772	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	2026-07-30_b1e7ac290d395863da1536e1d10b729e_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
1588	PING.EXE
2772	cmd.exe
3116	PING.EXE
5208	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3116	PING.EXE
5208	PING.EXE
1588	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 2444	4836	2026-07-30_b1e7ac290d395863da1536e1d10b729e_elex_wannacry.exe	88
PID 2444 wrote to memory of 2772	2444	WINWORD.exe	89
PID 2772 wrote to memory of 3116	2772	cmd.exe	91
PID 2772 wrote to memory of 5208	2772	cmd.exe	92
PID 2772 wrote to memory of 1588	2772	cmd.exe	93
PID 2772 wrote to memory of 1408	2772	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-30_b1e7ac290d395863da1536e1d10b729e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_b1e7ac290d395863da1536e1d10b729e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- 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:2444
- - 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\00006082" 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:2772
  - - 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:3116
  - - 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:5208
  - - 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:1588
  - - 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:1408

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

00006082

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006082
Size 39KB
SHA256 9940ee078330fd268300bbb2bc449a5516a4ad42ade37a9435b3b96458f24e2e
MD5 79bbd81fafad41eb8699efe3802e3da6
SHA1 3d75b42229c3753efc49022fb50acc8ed9ae9586
SHA512 d47342662add8b783d64a1388c4299b74d471b81b4b365d2d60dba537fd15cd8c90f416502caa6cfb6c328b73f8c81aa69066bfa5a5b95ad160d0c91d400a159
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB9:aLsF2Kerc64sTiX2IV0DVyIGFu
TLSH
T1B0036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 1b012af6526fa5dab407d2bfb99910d0477e46eaa4e54620bef37a4baf123b74
MD5 b1e7ac290d395863da1536e1d10b729e
SHA1 a24fda42375db902b6ead7869c8b760007220569
SHA512 ed1caeddbf82e8d062e1b8b9b0bc43e08b808925a344de255212640b444e1df24405e751d20f2f5677e1ef51abbce0572dfa508a61eb0cffc8a71defc4344d4a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBb:aLsF2Kerc64sTiX2IV0DVyIGFw
TLSH
T1EB035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1408-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1408-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2444-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4836-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4836-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads