juko | 8e15caaffe21a771c11190bd8e8f3fe7963c5f9349e346d355d99f01fc8fac34

General

Target
2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe
Size 39KB
Sample260802-a6frya1cpg
SHA256 8e15caaffe21a771c11190bd8e8f3fe7963c5f9349e346d355d99f01fc8fac34
MD5 4b340d05773eb8ef0da8377b53686eaf
SHA1 7e81a6e19b93b77cf0a2702a4d64f7bbb978dcb4
SHA512 ec42d8cd5641f64a51f84b5561dbc0690cb2253f733bc082407cad92d7c33e9c9eb515d058a789ba2c2f25a1e01d2065beaf73077b4cc47d1d9e51c12d120f8b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBM:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T11C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4364-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d000000016ce7-5.dat	family_juko
behavioral2/memory/4364-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4840-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c58f-13.dat	family_juko
behavioral2/memory/4180-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4180-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4840	WINWORD.exe
4180	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-1-5-21-2115213192-531537726-3295841909-1000\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
5116	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	2026-08-01_4b340d05773eb8ef0da8377b53686eaf_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
1220	PING.EXE
5848	PING.EXE
2056	PING.EXE
5116	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1220	PING.EXE
5848	PING.EXE
2056	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 4840	4364	2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe	89
PID 4840 wrote to memory of 5116	4840	WINWORD.exe	90
PID 5116 wrote to memory of 1220	5116	cmd.exe	92
PID 5116 wrote to memory of 5848	5116	cmd.exe	93
PID 5116 wrote to memory of 2056	5116	cmd.exe	94
PID 5116 wrote to memory of 4180	5116	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4364
- 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:4840
- - 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\00002268" 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:5116
  - - 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:1220
  - - 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:5848
  - - 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:2056
  - - 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:4180

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

00002268

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002268
Size 39KB
SHA256 1dd6c2d60a55a5e4174694f3e790fd4292b6aff641c6f9bf1e5c81aeb7cddd8c
MD5 7b508a3e998956d32e2c0befe57a7303
SHA1 243cdb34d3ac902c241c574b6e9d50b34c0477b7
SHA512 8b853afdbff8be7b0c367531cdf8c321dff2520fcc1784573512a4765504a8b27a841ff510b1ab589cd2dde79e2fe7b62ddbd5d7af8bb8ec67300331cbed61e8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBA:aLsF2Kerc64sTiX2IV0DVyIGFD
TLSH
T178036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 8e15caaffe21a771c11190bd8e8f3fe7963c5f9349e346d355d99f01fc8fac34
MD5 4b340d05773eb8ef0da8377b53686eaf
SHA1 7e81a6e19b93b77cf0a2702a4d64f7bbb978dcb4
SHA512 ec42d8cd5641f64a51f84b5561dbc0690cb2253f733bc082407cad92d7c33e9c9eb515d058a789ba2c2f25a1e01d2065beaf73077b4cc47d1d9e51c12d120f8b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBM:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T11C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4180-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4180-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4364-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4364-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4840-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads