juko | 5ba5b2871579d4760cc2a8382b03cf4f1646d7dcc1f8ed02ad5a6a35e92f2aae

General

Target
2026-07-01_90a286bab9fc21d181a40d799d4fe422_elex_wannacry.exe
Size 30KB
Sample260701-zleftaev8q
SHA256 5ba5b2871579d4760cc2a8382b03cf4f1646d7dcc1f8ed02ad5a6a35e92f2aae
MD5 90a286bab9fc21d181a40d799d4fe422
SHA1 c1f287f8dbc725d4ff3d8368816a8f9a49abe969
SHA512 7d3d9fb14e24ba463c77c54e26c1eb8bc479be97d83c630d1801cf6357ce79e5102cc461a12317913f20c1c58667a10850f349e8e97c4c121d5fe2f2a20d4c62
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXM:tLsF2Kerc64sTiX2IV0DzloM
TLSH
T115E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000800000001b85a-4.dat	family_juko
behavioral2/files/0x000e00000001c4a6-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2748	WINWORD.exe
588	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-1-5-21-2132828192-1552876075-2324613956-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-01_90a286bab9fc21d181a40d799d4fe422_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

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
5476	PING.EXE
4996	PING.EXE
4072	cmd.exe
3116	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3116	PING.EXE
5476	PING.EXE
4996	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5104 wrote to memory of 2748	5104	2026-07-01_90a286bab9fc21d181a40d799d4fe422_elex_wannacry.exe	88
PID 2748 wrote to memory of 4072	2748	WINWORD.exe	89
PID 4072 wrote to memory of 3116	4072	cmd.exe	91
PID 4072 wrote to memory of 5476	4072	cmd.exe	92
PID 4072 wrote to memory of 4996	4072	cmd.exe	93
PID 4072 wrote to memory of 588	4072	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-01_90a286bab9fc21d181a40d799d4fe422_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_90a286bab9fc21d181a40d799d4fe422_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5104
- 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:2748
- - 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\00000D31" 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:4072
  - - 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:3116
  - - 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:5476
  - - 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:4996
  - - 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:588

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

00000D31

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D31
Size 30KB
SHA256 80c5f78b03b3e7808fa025f98c5df0bc50f03952f6281ae996fa108494be1903
MD5 2760bf32b2a0d1de433b37c7951c6fab
SHA1 49b9d1790d5809ab90dc7bce2ed71c12d1170737
SHA512 8cafb98b0e056d8d738aa1ad6773e2b7d661b198a63eff5be556b2fdd6210906769f2ff9c4fea9d551feb880ab69c2c40f92e2259f69cedc88f4e451e01a2958
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX2:tLsF2Kerc64sTiX2IV0Dzlo2
TLSH
T1FDE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 5ba5b2871579d4760cc2a8382b03cf4f1646d7dcc1f8ed02ad5a6a35e92f2aae
MD5 90a286bab9fc21d181a40d799d4fe422
SHA1 c1f287f8dbc725d4ff3d8368816a8f9a49abe969
SHA512 7d3d9fb14e24ba463c77c54e26c1eb8bc479be97d83c630d1801cf6357ce79e5102cc461a12317913f20c1c58667a10850f349e8e97c4c121d5fe2f2a20d4c62
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXM:tLsF2Kerc64sTiX2IV0DzloM
TLSH
T115E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads