juko | aae8e967300ce62296e9b6305f0e78e62b7deafd5908868e8556d97529b937a2

General

Target
2026-06-28_65368657a5ebdb931b6acd7b31c69e4f_elex_wannacry.exe
Size 37KB
Sample260628-11d92ae15v
SHA256 aae8e967300ce62296e9b6305f0e78e62b7deafd5908868e8556d97529b937a2
MD5 65368657a5ebdb931b6acd7b31c69e4f
SHA1 52560933be7e25705dbac14d4696c26dd6dde448
SHA512 15d2fb9f2a9b5c573808d73d333c59124f4b421de3ef1c4d447cf63bc64f27cf52ccdac21b4873f6139e9dd767314f4bc361565ec40a7f7ebdd4b8a619c47979
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0DhuogwN
TLSH
T10A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/932-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000600000001b84e-5.dat	family_juko
behavioral2/memory/932-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6060-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c598-13.dat	family_juko
behavioral2/memory/1376-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1376-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6060	WINWORD.exe
1376	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-1-5-21-487906980-2895880840-1957110281-1000\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

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	2026-06-28_65368657a5ebdb931b6acd7b31c69e4f_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
5832	PING.EXE
3948	PING.EXE
1856	PING.EXE
4972	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5832	PING.EXE
3948	PING.EXE
1856	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 932 wrote to memory of 6060	932	2026-06-28_65368657a5ebdb931b6acd7b31c69e4f_elex_wannacry.exe	89
PID 6060 wrote to memory of 4972	6060	WINWORD.exe	90
PID 4972 wrote to memory of 5832	4972	cmd.exe	92
PID 4972 wrote to memory of 3948	4972	cmd.exe	93
PID 4972 wrote to memory of 1856	4972	cmd.exe	94
PID 4972 wrote to memory of 1376	4972	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-28_65368657a5ebdb931b6acd7b31c69e4f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-28_65368657a5ebdb931b6acd7b31c69e4f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:932
- 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:6060
- - 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\000052B6" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4972
  - - 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:5832
  - - 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:3948
  - - 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:1856
  - - 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:1376

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

000052B6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000052B6
Size 37KB
SHA256 8646c4e360f5477946a4949623043cfd067fc4dc75dd93d0221ae2c5baebb1af
MD5 7b450cb75d30c29a5722e79914f6740a
SHA1 1075169c8c0a046c14d8440810ae8f89d3f6d9fa
SHA512 81eb98126fca5e6bc6f05606f192a5f3f93333ffaccbe00b0315d79b4ac4fb0182118fa21610445856ceabd01e22a6559ae86c6f5daf6b13b5c41c5343f7175e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaw:3LsF2Kerc64sTiX2IV0Dhuogwn
TLSH
T168035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 aae8e967300ce62296e9b6305f0e78e62b7deafd5908868e8556d97529b937a2
MD5 65368657a5ebdb931b6acd7b31c69e4f
SHA1 52560933be7e25705dbac14d4696c26dd6dde448
SHA512 15d2fb9f2a9b5c573808d73d333c59124f4b421de3ef1c4d447cf63bc64f27cf52ccdac21b4873f6139e9dd767314f4bc361565ec40a7f7ebdd4b8a619c47979
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0DhuogwN
TLSH
T10A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/932-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/932-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1376-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1376-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6060-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads