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
behavioral2/memory/2680-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x00160000000118ee-5.dat	family_juko
behavioral2/memory/2680-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6496-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c56a-13.dat	family_juko
behavioral2/memory/6832-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6832-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6496	WINWORD.exe
6832	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-1-5-21-1014449518-1831897916-4205727055-1000\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
6848	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	2026-08-04_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
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
6252	PING.EXE
6296	PING.EXE
6848	cmd.exe
5240	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5240	PING.EXE
6252	PING.EXE
6296	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 6496	2680	2026-08-04_c6fbd69bb57e9ed20fe7a0b2ea4e0106_elex_wannacry.exe	90
PID 6496 wrote to memory of 6848	6496	WINWORD.exe	91
PID 6848 wrote to memory of 5240	6848	cmd.exe	93
PID 6848 wrote to memory of 6252	6848	cmd.exe	94
PID 6848 wrote to memory of 6296	6848	cmd.exe	95
PID 6848 wrote to memory of 6832	6848	cmd.exe	96

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2680
- 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:6496
- - 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\000046EB" 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:6848
  - - 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:5240
  - - 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:6252
  - - 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:6296
  - - 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:6832

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

Replay Monitor

Loading Replay Monitor...

Downloads

000046EB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000046EB
Size 39KB
SHA256 0c8a6f7fe7372874ec9a3b181af2f71a1a7bd6699470a522c6cfcd73010951c5
MD5 a6cb9c0d5af88473d315805e4424d50f
SHA1 0346d91b2283350d1e43d170164928d4c236f634
SHA512 aae454a9a51577c51e3db0975f0dba8371b96ec6cf98c93710d1b62cd8ad58ea1faebc02e643c2e559a9146a31b2af6ee4c282a13fb5af11b42cd04cd376fdb7
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBo:aLsF2Kerc64sTiX2IV0DVyIGFT
TLSH
T1E8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2680-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2680-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6496-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6832-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6832-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads