juko | 1aa87a19ba049da7732cddc255e4c2047e8d76ccbe262cbbc778e20efc53f211

General

Target
2026-08-10_15db2a1a81f94b64177f710602bc5e2c_elex_wannacry.exe
Size 30KB
Sample260810-pmtxsatwbw
SHA256 1aa87a19ba049da7732cddc255e4c2047e8d76ccbe262cbbc778e20efc53f211
MD5 15db2a1a81f94b64177f710602bc5e2c
SHA1 314a3199c798bc66334709b5eacf563b4dd67f6a
SHA512 1761eb91d6c3eb836285fe90de3e1f660f0fddf88577458acdd5e21d183ad7011547e247e8d320c9a606786db0923100f644f922f9e742105ac5c58976423809
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHr3:OLsF2Kerc64sTiX2IV0DkFM3
TLSH
T1A6E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000600000000053e-4.dat	family_juko
behavioral2/files/0x0006000000016b40-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3240	WINWORD.exe
704	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-1-5-21-3797332335-34111092-3597280141-1000\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
3136	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	2026-08-10_15db2a1a81f94b64177f710602bc5e2c_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
2644	PING.EXE
1212	PING.EXE
1620	PING.EXE
3136	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1620	PING.EXE
2644	PING.EXE
1212	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2500 wrote to memory of 3240	2500	2026-08-10_15db2a1a81f94b64177f710602bc5e2c_elex_wannacry.exe	89
PID 3240 wrote to memory of 3136	3240	WINWORD.exe	90
PID 3136 wrote to memory of 2644	3136	cmd.exe	92
PID 3136 wrote to memory of 1212	3136	cmd.exe	93
PID 3136 wrote to memory of 1620	3136	cmd.exe	94
PID 3136 wrote to memory of 704	3136	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_15db2a1a81f94b64177f710602bc5e2c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_15db2a1a81f94b64177f710602bc5e2c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2500
- 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:3240
- - 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\00002EDF" 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:3136
  - - 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:2644
  - - 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:1212
  - - 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:1620
  - - 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:704

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

00002EDF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002EDF
Size 30KB
SHA256 c95f602b74dedab1701b222f3459a656dd479a0d0646812e7b38c0289cda9976
MD5 c4bde729a4c8b6ca18c7aa0fba26c073
SHA1 35ecb4274e590cc1594e5f3701f263eab27bea85
SHA512 9f71ba4ff75645d751cae8632dbd65258c5532e8ef419faa1c22861776fff4f64779374f4a43ed0b7ee22fd11b4842f416afb6fa56f4d01ef8a57448a2e65f86
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrd:OLsF2Kerc64sTiX2IV0DkFMd
TLSH
T169E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 1aa87a19ba049da7732cddc255e4c2047e8d76ccbe262cbbc778e20efc53f211
MD5 15db2a1a81f94b64177f710602bc5e2c
SHA1 314a3199c798bc66334709b5eacf563b4dd67f6a
SHA512 1761eb91d6c3eb836285fe90de3e1f660f0fddf88577458acdd5e21d183ad7011547e247e8d320c9a606786db0923100f644f922f9e742105ac5c58976423809
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHr3:OLsF2Kerc64sTiX2IV0DkFM3
TLSH
T1A6E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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