juko | af026b8bd3bb508899630085db8479a22827a39854b430ed7577741819d0e0c3

General

Target
2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_elex_wannacry.exe
Size 39KB
Sample260804-wvvmlseh77
SHA256 af026b8bd3bb508899630085db8479a22827a39854b430ed7577741819d0e0c3
MD5 c6fbd69bb57e9ed20fe7a0b2ea4e0106
SHA1 e28bbeffd29e201a496141b18eaec97956e540f7
SHA512 24b9b525c769d3322964f1aa4c9292f3bb356a873dd1b17c2f5a46ade88a5a50227150dc79ac7faa166cbeaa20964350f2228b6dbc93dbc6f1f971e543736c22
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBd:aLsF2Kerc64sTiX2IV0DVyIGFm
TLSH
T1E2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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
behavioral1/memory/3308-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b00000002433e-5.dat	family_juko
behavioral1/memory/3308-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/408-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000900000002447b-15.dat	family_juko
behavioral1/memory/4736-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4736-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
408	WINWORD.exe
4736	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-1-5-21-204488895-2999877624-296153668-1000\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
4772	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_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

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
4060	PING.EXE
2304	PING.EXE
4124	PING.EXE
4772	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4060	PING.EXE
2304	PING.EXE
4124	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3308 wrote to memory of 408	3308	2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_elex_wannacry.exe	86
PID 408 wrote to memory of 4772	408	WINWORD.exe	87
PID 4772 wrote to memory of 4060	4772	cmd.exe	89
PID 4772 wrote to memory of 2304	4772	cmd.exe	90
PID 4772 wrote to memory of 4124	4772	cmd.exe	91
PID 4772 wrote to memory of 4736	4772	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3308
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:408
- - 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\00005A3E" 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:4772
  - - 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:4060
  - - 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:2304
  - - 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:4124
  - - 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:4736

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00005A3E

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005A3E
Size 39KB
SHA256 b21f8f00bc6151b41e765c765e67de516d4bbd92d5915dd4ce22de70b765114b
MD5 4063a82bed6af36257649adb6ffd5d3e
SHA1 f45243c28432965d9e063d6a5e6dc4ac2dfa672f
SHA512 3e97e344e99480cffd2688b185e6f1addd00dbb6cfb685664842c91d0d1549e29f8eec62c7540543822121cfb7c63ac63a9e83aa4f095e1ee9433ef7a63512ea
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGFn
TLSH
T1BA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 af026b8bd3bb508899630085db8479a22827a39854b430ed7577741819d0e0c3
MD5 c6fbd69bb57e9ed20fe7a0b2ea4e0106
SHA1 e28bbeffd29e201a496141b18eaec97956e540f7
SHA512 24b9b525c769d3322964f1aa4c9292f3bb356a873dd1b17c2f5a46ade88a5a50227150dc79ac7faa166cbeaa20964350f2228b6dbc93dbc6f1f971e543736c22
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBd:aLsF2Kerc64sTiX2IV0DVyIGFm
TLSH
T1E2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/408-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3308-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3308-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4736-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4736-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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