juko | be20aa19afe628bc6d382a6ac345134706c1605f0fde81a82aa2df26b06e3456

General

Target
2026-08-02_520ac99f8fa0df9840c4512d9de32579_elex_wannacry.exe
Size 39KB
Sample260802-kmjplaygkh
SHA256 be20aa19afe628bc6d382a6ac345134706c1605f0fde81a82aa2df26b06e3456
MD5 520ac99f8fa0df9840c4512d9de32579
SHA1 c18bbafbe8d4fffafe2dc0da3978e3636c738929
SHA512 9bd4015e9fce3e2c0f83c151d76267ecf2e7bfafe9359325f7bd2f23b916614f1528d9f051e4224c2c9c05dab2e4731ef09071e210a2ba88110ebd9cc34c7606
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBB:aLsF2Kerc64sTiX2IV0DVyIGFi
TLSH
T12C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3472-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/3472-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4172-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/3272-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3272-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4172	WINWORD.exe
3272	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4576	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	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	2026-08-02_520ac99f8fa0df9840c4512d9de32579_elex_wannacry.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
4576	cmd.exe
5212	PING.EXE
4940	PING.EXE
1496	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1496	PING.EXE
5212	PING.EXE
4940	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3472 wrote to memory of 4172	3472	2026-08-02_520ac99f8fa0df9840c4512d9de32579_elex_wannacry.exe	89
PID 4172 wrote to memory of 4576	4172	WINWORD.exe	90
PID 4576 wrote to memory of 5212	4576	cmd.exe	92
PID 4576 wrote to memory of 4940	4576	cmd.exe	93
PID 4576 wrote to memory of 1496	4576	cmd.exe	94
PID 4576 wrote to memory of 3272	4576	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_520ac99f8fa0df9840c4512d9de32579_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_520ac99f8fa0df9840c4512d9de32579_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3472
- 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:4172
- - 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\00004D18" 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:4576
  - - 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:5212
  - - 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:4940
  - - 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:1496
  - - 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:3272

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

00004D18

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004D18
Size 39KB
SHA256 bb05e9b2f006ea071aa7331e2c61e66b6eae31fabca0470bf51310c6bdc4fff6
MD5 cadebc16e0962917830bd72acbb784c8
SHA1 998ddd642db5b8be5d73f964b5a61f2cc62b8c10
SHA512 77485fd584ea31993226675e92898fb608d535f12775abfc3b4451da08a20fcbadcb3f789b13ff462879430eeb81933c77a084e8387d5c5d9480dc6f583587e8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBm:aLsF2Kerc64sTiX2IV0DVyIGF9
TLSH
T186036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 be20aa19afe628bc6d382a6ac345134706c1605f0fde81a82aa2df26b06e3456
MD5 520ac99f8fa0df9840c4512d9de32579
SHA1 c18bbafbe8d4fffafe2dc0da3978e3636c738929
SHA512 9bd4015e9fce3e2c0f83c151d76267ecf2e7bfafe9359325f7bd2f23b916614f1528d9f051e4224c2c9c05dab2e4731ef09071e210a2ba88110ebd9cc34c7606
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBB:aLsF2Kerc64sTiX2IV0DVyIGFi
TLSH
T12C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3272-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3272-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3472-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3472-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4172-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads