juko | f477c1063edbad2a48fdd334961ba0e63c9f5843c128617bddd42785f2eadec5

General

Target
2026-05-04_d59dfc7163f31e0a4ddb9083733f9169_elex_wannacry.exe
Size 30KB
Sample260504-e2z28sfz7n
SHA256 f477c1063edbad2a48fdd334961ba0e63c9f5843c128617bddd42785f2eadec5
MD5 d59dfc7163f31e0a4ddb9083733f9169
SHA1 eb5f05f81c68208ebeb2d3a3c1b40d743481e091
SHA512 724d203e42b2c8a96f47533c88ced2f1a2911208d82ce7a7510f10f925684721746f396f70aaa827ac2268c9ee02dde254b0001615218af5c582df2f5caa20ed
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXp:tLsF2Kerc64sTiX2IV0Dzlop
TLSH
T10AE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x002600000002b1e0-4.dat	family_juko
behavioral2/files/0x001c00000002b35b-9.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
444	WINWORD.exe
2028	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-1-5-21-3119821332-640943685-2562343641-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-04_d59dfc7163f31e0a4ddb9083733f9169_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
2200	cmd.exe
3476	PING.EXE
1684	PING.EXE
4016	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4016	PING.EXE
3476	PING.EXE
1684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3500 wrote to memory of 444	3500	2026-05-04_d59dfc7163f31e0a4ddb9083733f9169_elex_wannacry.exe	79
PID 444 wrote to memory of 2200	444	WINWORD.exe	80
PID 2200 wrote to memory of 3476	2200	cmd.exe	82
PID 2200 wrote to memory of 1684	2200	cmd.exe	83
PID 2200 wrote to memory of 4016	2200	cmd.exe	84
PID 2200 wrote to memory of 2028	2200	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-04_d59dfc7163f31e0a4ddb9083733f9169_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_d59dfc7163f31e0a4ddb9083733f9169_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3500
- 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:444
- - 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\0000548D" 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:2200
  - - 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:3476
  - - 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:1684
  - - 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:4016
  - - 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:2028

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

0000548D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000548D
Size 30KB
SHA256 125368080e823d2dd072efd641f955c5b3cacebf54c9b604862d77c80196169c
MD5 21611d0a2314295ce222c4f7a9fd85b1
SHA1 18848ceed08f29bfba19ce80fe02bc046fd9e936
SHA512 8e23534f102733304a248f2052a09d92685a4c3b000d1c51e258831f29196da2bcb0aafc210180271d893f8b69be0f371f75cd23a2c53013236db605ea0fe3d2
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXS:tLsF2Kerc64sTiX2IV0DzloS
TLSH
T1E7E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 f477c1063edbad2a48fdd334961ba0e63c9f5843c128617bddd42785f2eadec5
MD5 d59dfc7163f31e0a4ddb9083733f9169
SHA1 eb5f05f81c68208ebeb2d3a3c1b40d743481e091
SHA512 724d203e42b2c8a96f47533c88ced2f1a2911208d82ce7a7510f10f925684721746f396f70aaa827ac2268c9ee02dde254b0001615218af5c582df2f5caa20ed
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXp:tLsF2Kerc64sTiX2IV0Dzlop
TLSH
T10AE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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