juko | cbcb18c0e3941cd9dc5f545f0c41bd6adefbfdeff3e3d4466cb78fa745204d31

General

Target
2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe
Size 39KB
Sample260808-wha3faeg55
SHA256 cbcb18c0e3941cd9dc5f545f0c41bd6adefbfdeff3e3d4466cb78fa745204d31
MD5 5324ff4bd551ffe28ed0a45b3d659990
SHA1 004b82d1a9a42cb69d50b08f14876b52320995c6
SHA512 4c5ec6dbdef74869fbc49c03f2fc48fb70b897452593360d645a7674b47a928ef9512ac476bfca6353d78b30333286153e6748e702d5cbc649842718426da920
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBt:aLsF2Kerc64sTiX2IV0DVyIGFS
TLSH
T1FF036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3056-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00130000000243ce-5.dat	family_juko
behavioral1/memory/3056-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1720-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00090000000244af-15.dat	family_juko
behavioral1/memory/4696-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4696-18-0x0000000000400000-0x000000000041D000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1720	WINWORD.exe
4696	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-1-5-21-668679576-120646659-2289335452-1000\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
3272	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_5324ff4bd551ffe28ed0a45b3d659990_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
3272	cmd.exe
1964	PING.EXE
2740	PING.EXE
4592	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1964	PING.EXE
2740	PING.EXE
4592	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 1720	3056	2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe	86
PID 1720 wrote to memory of 3272	1720	WINWORD.exe	87
PID 3272 wrote to memory of 1964	3272	cmd.exe	89
PID 3272 wrote to memory of 2740	3272	cmd.exe	90
PID 3272 wrote to memory of 4592	3272	cmd.exe	91
PID 3272 wrote to memory of 4696	3272	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_5324ff4bd551ffe28ed0a45b3d659990_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3056
- 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:1720
- - 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\00004AE5" 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:3272
  - - 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:1964
  - - 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:2740
  - - 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:4592
  - - 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:4696

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

00004AE5

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004AE5
Size 39KB
SHA256 2a0495125280713e78530bedf77337ee1134238f4a4e196104545cdda1c77abc
MD5 81f916f262fff70f3a8efeddfa56c306
SHA1 3bc08703da7c6c7bfafc4e3c18855b0669e081e4
SHA512 a129592c3ccc38b141c0601f0a91a0327c2075924388ba17e7af37da595cc37be75904ea995d5f3410d091127f278ff985ace3a07c1711e5b1c7180cdf4ab8e3
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBR:aLsF2Kerc64sTiX2IV0DVyIGFa
TLSH
T12C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 cbcb18c0e3941cd9dc5f545f0c41bd6adefbfdeff3e3d4466cb78fa745204d31
MD5 5324ff4bd551ffe28ed0a45b3d659990
SHA1 004b82d1a9a42cb69d50b08f14876b52320995c6
SHA512 4c5ec6dbdef74869fbc49c03f2fc48fb70b897452593360d645a7674b47a928ef9512ac476bfca6353d78b30333286153e6748e702d5cbc649842718426da920
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBt:aLsF2Kerc64sTiX2IV0DVyIGFS
TLSH
T1FF036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1720-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3056-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3056-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4696-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4696-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads