juko | bb7c0b7780612b113788a4f631ed4119ee8b2f430d9a0ac83cd29c403eff96fa

General

Target
2026-09-03_9efd74f3b217d4f2b358964ec82489c6_elex_wannacry.exe
Size 39KB
Sample260905-2epz3stepg
SHA256 bb7c0b7780612b113788a4f631ed4119ee8b2f430d9a0ac83cd29c403eff96fa
MD5 9efd74f3b217d4f2b358964ec82489c6
SHA1 adb70a6fe2eb9de00adfb5d3e8f9a10619944856
SHA512 0f94e5a5288e4f84d17b7303314b8a899b92137e829dd5993d716d335f2d34c06ced66d28ee3bdb6c712260a81fb0cf212a8fbcc20203637b603f77f956c8827
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBi:aLsF2Kerc64sTiX2IV0DVyIGFp
TLSH
T1EE036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 8 IoCs

resource	yara_rule
behavioral1/memory/1680-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000e000000024352-5.dat	family_juko
behavioral1/memory/2716-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1680-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2716-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0009000000024572-16.dat	family_juko
behavioral1/memory/956-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/956-19-0x0000000000400000-0x000000000041D000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-09-03_9efd74f3b217d4f2b358964ec82489c6_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2716	WINWORD.exe
956	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-1-5-21-1074038928-2032447174-945360078-1000\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
4708	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	2026-09-03_9efd74f3b217d4f2b358964ec82489c6_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
4708	cmd.exe
4780	PING.EXE
2580	PING.EXE
4340	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4780	PING.EXE
2580	PING.EXE
4340	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1680 wrote to memory of 2716	1680	2026-09-03_9efd74f3b217d4f2b358964ec82489c6_elex_wannacry.exe	85
PID 2716 wrote to memory of 4708	2716	WINWORD.exe	86
PID 4708 wrote to memory of 4780	4708	cmd.exe	88
PID 4708 wrote to memory of 2580	4708	cmd.exe	89
PID 4708 wrote to memory of 4340	4708	cmd.exe	90
PID 4708 wrote to memory of 956	4708	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-09-03_9efd74f3b217d4f2b358964ec82489c6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-03_9efd74f3b217d4f2b358964ec82489c6_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1680
- 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:2716
- - 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\00005CFE" 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:4708
  - - 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:4780
  - - 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:2580
  - - 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:4340
  - - 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:956

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

00005CFE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005CFE
Size 39KB
SHA256 128c179ea4bb2b3e8209b44930ab10b24392c8444ffc2128e28504074e869ef0
MD5 e78ff96bd58aef676533ee528aceb78b
SHA1 f2e0e5a38dd6c750c94afb99e6ea94f33d546ee9
SHA512 39c77de9be635f6ef0b7225b069b11a5824d5e6d5d24706974925d056e668bded2ae5a8e3c2d045d34e18967aa0b5a0db36d4c9a3c11b85fb3e9a6f929d5ccec
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB+:aLsF2Kerc64sTiX2IV0DVyIGF1
TLSH
T12B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 bb7c0b7780612b113788a4f631ed4119ee8b2f430d9a0ac83cd29c403eff96fa
MD5 9efd74f3b217d4f2b358964ec82489c6
SHA1 adb70a6fe2eb9de00adfb5d3e8f9a10619944856
SHA512 0f94e5a5288e4f84d17b7303314b8a899b92137e829dd5993d716d335f2d34c06ced66d28ee3bdb6c712260a81fb0cf212a8fbcc20203637b603f77f956c8827
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBi:aLsF2Kerc64sTiX2IV0DVyIGFp
TLSH
T1EE036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/956-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/956-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1680-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1680-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2716-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2716-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads