juko | 1939b00a4203683c311a23bab46f4c88dded0a47ef062eab3dd4d41d0eec7569

General

Target
2026-08-04_d5542c8d896707edde61335e78f9a02e_elex_wannacry.exe
Size 39KB
Sample260804-wk4grstyft
SHA256 1939b00a4203683c311a23bab46f4c88dded0a47ef062eab3dd4d41d0eec7569
MD5 d5542c8d896707edde61335e78f9a02e
SHA1 7c93b0f56250cb65b3ff0d5f66ab1c79bf3cf807
SHA512 fd231e194a43a67dd3c4502208a8892561d93dc97807c113cb1d6af9c643dad67a1343a3b6bcb75c8843628033b0437c724ec74ec2cd0b2b1e02f9101562ff8b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBw:aLsF2Kerc64sTiX2IV0DVyIGFD
TLSH
T1DF036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/5840-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001b87d-5.dat	family_juko
behavioral2/memory/5840-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4352-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c44e-13.dat	family_juko
behavioral2/memory/3480-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3480-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4352	WINWORD.exe
3480	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-1-5-21-3797332335-34111092-3597280141-1000\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
1676	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	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	2026-08-04_d5542c8d896707edde61335e78f9a02e_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

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
1676	cmd.exe
4116	PING.EXE
2440	PING.EXE
5928	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4116	PING.EXE
2440	PING.EXE
5928	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5840 wrote to memory of 4352	5840	2026-08-04_d5542c8d896707edde61335e78f9a02e_elex_wannacry.exe	89
PID 4352 wrote to memory of 1676	4352	WINWORD.exe	90
PID 1676 wrote to memory of 4116	1676	cmd.exe	92
PID 1676 wrote to memory of 2440	1676	cmd.exe	93
PID 1676 wrote to memory of 5928	1676	cmd.exe	94
PID 1676 wrote to memory of 3480	1676	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_d5542c8d896707edde61335e78f9a02e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_d5542c8d896707edde61335e78f9a02e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5840
- 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:4352
- - 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\00004750" 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:1676
  - - 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:4116
  - - 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:2440
  - - 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:5928
  - - 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:3480

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

00004750

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004750
Size 39KB
SHA256 392ff1313363c6c7fd914c67e51fddd4bf4b95159e52d65046b9a80b02ed4123
MD5 3eac36b8c76702c5d40053b8654fb8dd
SHA1 521e0cf84e1cc6af4e9477f5d82db34983eeec7e
SHA512 3e28f0ecabf79c6938f1d175c26172608bcbfcafc1ac42c79dd7faa1498de4895929693834d218ae4694253bbfa8f6edbb064d762f253419aa55173bab684afb
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBl:aLsF2Kerc64sTiX2IV0DVyIGFq
TLSH
T129036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 1939b00a4203683c311a23bab46f4c88dded0a47ef062eab3dd4d41d0eec7569
MD5 d5542c8d896707edde61335e78f9a02e
SHA1 7c93b0f56250cb65b3ff0d5f66ab1c79bf3cf807
SHA512 fd231e194a43a67dd3c4502208a8892561d93dc97807c113cb1d6af9c643dad67a1343a3b6bcb75c8843628033b0437c724ec74ec2cd0b2b1e02f9101562ff8b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBw:aLsF2Kerc64sTiX2IV0DVyIGFD
TLSH
T1DF036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3480-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3480-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4352-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5840-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5840-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads