juko | e7b359d1d81419a1497aa7cbfc419938cb9051dc832a9597e9e17e433c8098b9

General

Target
2026-09-01_7af07596c95e60b4b32f3d3469643144_elex_wannacry.exe
Size 30KB
Sample260903-ld3xjstdlg
SHA256 e7b359d1d81419a1497aa7cbfc419938cb9051dc832a9597e9e17e433c8098b9
MD5 7af07596c95e60b4b32f3d3469643144
SHA1 5b6f22b3119f877bf7abe56c5646ac39a666cb88
SHA512 e9184beb41b7b418ae4c638e29224057686470517b1f38704fc8805b7a60dab4d557c40ab08ea0a3d5530d06f560fe922607275360e2163ff1f4c64ad57914ae
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrg:OLsF2Kerc64sTiX2IV0DkFMg
TLSH
T119E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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/0x000700000001b86d-4.dat	family_juko
behavioral2/files/0x001000000001c489-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5356	WINWORD.exe
1952	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-1-5-21-189034102-168398478-1159367937-1000\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
3152	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 6 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	2026-09-01_7af07596c95e60b4b32f3d3469643144_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
3152	cmd.exe
2128	PING.EXE
3408	PING.EXE
3488	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2128	PING.EXE
3408	PING.EXE
3488	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2536 wrote to memory of 5356	2536	2026-09-01_7af07596c95e60b4b32f3d3469643144_elex_wannacry.exe	89
PID 5356 wrote to memory of 3152	5356	WINWORD.exe	90
PID 3152 wrote to memory of 2128	3152	cmd.exe	92
PID 3152 wrote to memory of 3408	3152	cmd.exe	93
PID 3152 wrote to memory of 3488	3152	cmd.exe	94
PID 3152 wrote to memory of 1952	3152	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-01_7af07596c95e60b4b32f3d3469643144_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-01_7af07596c95e60b4b32f3d3469643144_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2536
- 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:5356
- - 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\00007779" 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:3152
  - - 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:2128
  - - 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:3408
  - - 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:3488
  - - 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
      PID:1952

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

00007779

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007779
Size 30KB
SHA256 0a4544c8968cec6e33628a4ac21cda4cb453b402115e2efd38be97729440cbd8
MD5 a40322207808cbd838826dfe002f2eb2
SHA1 cf616ddbd9f5e44ed9e563017b46057ecf2855fd
SHA512 c0384b70080c62931a0187a2e670ab93d439c1a945f83b680cccb662a31263478b370a7e35786e3722bbf87e5262bfcb354f976a9ceaa987031f86cda2a79ed2
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrp:OLsF2Kerc64sTiX2IV0DkFMp
TLSH
T192E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D66DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 e7b359d1d81419a1497aa7cbfc419938cb9051dc832a9597e9e17e433c8098b9
MD5 7af07596c95e60b4b32f3d3469643144
SHA1 5b6f22b3119f877bf7abe56c5646ac39a666cb88
SHA512 e9184beb41b7b418ae4c638e29224057686470517b1f38704fc8805b7a60dab4d557c40ab08ea0a3d5530d06f560fe922607275360e2163ff1f4c64ad57914ae
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrg:OLsF2Kerc64sTiX2IV0DkFMg
TLSH
T119E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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