juko | 99eeeceee7317d50a6dd1f891cae742f0f8f4568b6345edd504a84ef6c5e33b2

General

Target
2026-08-18_8e2e882290004d71f11eae517fba24f7_elex_wannacry.exe
Size 64KB
Sample260818-3cw62sserc
SHA256 99eeeceee7317d50a6dd1f891cae742f0f8f4568b6345edd504a84ef6c5e33b2
MD5 8e2e882290004d71f11eae517fba24f7
SHA1 05165f1dd9a868a3af289dd62ce75867489c6340
SHA512 80f92d2b095d0dfe4e5ddf2244944398b4394c8637a37116ff6c5df4ba1750e689b28a6a21be9bf9ec34f1c21fb90ddb99c74219bb0b37392e23568bf99b1ab7
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u/:sLy2Kerc64CiGIm8so28/
TLSH
T177535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x001100000001c4fd-4.dat	family_juko
behavioral2/files/0x001000000001c57d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4948	WINWORD.exe
5668	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-1-5-21-552508041-2681165170-3229858294-1000\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
2364	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	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	2026-08-18_8e2e882290004d71f11eae517fba24f7_elex_wannacry.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
2364	cmd.exe
5756	PING.EXE
2792	PING.EXE
4232	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5756	PING.EXE
2792	PING.EXE
4232	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6080 wrote to memory of 4948	6080	2026-08-18_8e2e882290004d71f11eae517fba24f7_elex_wannacry.exe	89
PID 4948 wrote to memory of 2364	4948	WINWORD.exe	90
PID 2364 wrote to memory of 5756	2364	cmd.exe	92
PID 2364 wrote to memory of 2792	2364	cmd.exe	93
PID 2364 wrote to memory of 4232	2364	cmd.exe	94
PID 2364 wrote to memory of 5668	2364	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-18_8e2e882290004d71f11eae517fba24f7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_8e2e882290004d71f11eae517fba24f7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6080
- 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:4948
- - 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\00007351" 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:2364
  - - 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:5756
  - - 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:2792
  - - 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:4232
  - - 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:5668

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

00007351

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007351
Size 64KB
SHA256 b5cbc4d6135e7890bdf9acae3eba51dad22afea880c9036048e4af44facf081d
MD5 98688c9852c4eac8e140e77c904c81b2
SHA1 8e71dc98c6af4a662d4cf6aa914e6242b1c4cbf0
SHA512 f8d6f61913d6f4891424e9784001769e3dfe99c20b7f2fde7c4163ac20738c4606ce60defd7463b84ed53abf7504b2fa4a0456e7975854d62c0e9405dc5d47de
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u5:sLy2Kerc64CiGIm8so285
TLSH
T1DD535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 99eeeceee7317d50a6dd1f891cae742f0f8f4568b6345edd504a84ef6c5e33b2
MD5 8e2e882290004d71f11eae517fba24f7
SHA1 05165f1dd9a868a3af289dd62ce75867489c6340
SHA512 80f92d2b095d0dfe4e5ddf2244944398b4394c8637a37116ff6c5df4ba1750e689b28a6a21be9bf9ec34f1c21fb90ddb99c74219bb0b37392e23568bf99b1ab7
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u/:sLy2Kerc64CiGIm8so28/
TLSH
T177535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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