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 7 IoCs

resource	yara_rule
behavioral2/memory/5404-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000900000001b884-5.dat	family_juko
behavioral2/memory/5404-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5428-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0007000000000405-13.dat	family_juko
behavioral2/memory/552-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/552-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5428	WINWORD.exe
552	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-1-5-21-552508041-2681165170-3229858294-1000\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
3740	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	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
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

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
3216	PING.EXE
3740	cmd.exe
1688	PING.EXE
2428	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1688	PING.EXE
2428	PING.EXE
3216	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5404 wrote to memory of 5428	5404	2026-09-03_9efd74f3b217d4f2b358964ec82489c6_elex_wannacry.exe	89
PID 5428 wrote to memory of 3740	5428	WINWORD.exe	90
PID 3740 wrote to memory of 1688	3740	cmd.exe	92
PID 3740 wrote to memory of 2428	3740	cmd.exe	93
PID 3740 wrote to memory of 3216	3740	cmd.exe	94
PID 3740 wrote to memory of 552	3740	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5404
- 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:5428
- - 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\00000702" 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:3740
  - - 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:1688
  - - 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:2428
  - - 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:3216
  - - 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:552

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

00000702

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000702
Size 39KB
SHA256 936479f85c78e8a2b38d89e4c4dc6a829cbac2b9c2943470233aae622fb12972
MD5 c1345b3f2419b438083ca2508aa9529e
SHA1 196cebe9b56bca3e8b0a3b6034c33cdc88da97ec
SHA512 3c35651616c74e14d1b13b7eeb6a7e9fb27240a480271860ee8a3b4a25eb17b1d06de20a444d359d645fc0af53dd0726e96b4dc017b0deccae2939548beb6052
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBp:aLsF2Kerc64sTiX2IV0DVyIGFa
TLSH
T172036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/552-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/552-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5404-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5404-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5428-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads