juko | 8acfb30df980ae0b3e88cee00155efd9798d84468cbfc744da79d12ecd9e9f58

General

Target
2026-08-04_5ffa29ba9d03a59d5d6edaf71cf7aab3_elex_wannacry.exe
Size 143KB
Sample260804-hxeghseh79
SHA256 8acfb30df980ae0b3e88cee00155efd9798d84468cbfc744da79d12ecd9e9f58
MD5 5ffa29ba9d03a59d5d6edaf71cf7aab3
SHA1 64162d5e3c06dbc761aefa391ad70fe8cbeb8898
SHA512 5da207d1bdd4de691a3eb72f0075432b10180d1200d3d23f28f8698ce2e86f1ce935507f134964902f2a23570bea3514eb434ebca928ebabc7669236e347c99d
SSDEEP 3072:lLy2Kerc64CiGImEsXpKK888888888888W88888888888GizGJuud+tfcv:lLy2Kwc64YIZwX888888888888W8888T
TLSH
T17CE3C60273E71071F9F75A3499760A105E377CB929F2E11A2E30F60E1971AC69DB2B27
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 7 IoCs

resource	yara_rule
behavioral2/memory/4876-0-0x0000000000400000-0x0000000000435000-memory.dmp	family_juko
behavioral2/files/0x001400000001b1d0-5.dat	family_juko
behavioral2/memory/4876-9-0x0000000000400000-0x0000000000435000-memory.dmp	family_juko
behavioral2/memory/2260-12-0x0000000000400000-0x0000000000435000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c551-13.dat	family_juko
behavioral2/memory/4636-15-0x0000000000400000-0x0000000000435000-memory.dmp	family_juko
behavioral2/memory/4636-16-0x0000000000400000-0x0000000000435000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2260	WINWORD.exe
4636	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-1-5-21-1738198120-2966725515-3980530802-1000\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
1812	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	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	2026-08-04_5ffa29ba9d03a59d5d6edaf71cf7aab3_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
3752	PING.EXE
1812	cmd.exe
472	PING.EXE
4768	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
472	PING.EXE
4768	PING.EXE
3752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4876 wrote to memory of 2260	4876	2026-08-04_5ffa29ba9d03a59d5d6edaf71cf7aab3_elex_wannacry.exe	88
PID 2260 wrote to memory of 1812	2260	WINWORD.exe	89
PID 1812 wrote to memory of 472	1812	cmd.exe	91
PID 1812 wrote to memory of 4768	1812	cmd.exe	92
PID 1812 wrote to memory of 3752	1812	cmd.exe	93
PID 1812 wrote to memory of 4636	1812	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-04_5ffa29ba9d03a59d5d6edaf71cf7aab3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_5ffa29ba9d03a59d5d6edaf71cf7aab3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4876
- 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:2260
- - 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\00006DFB" 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:1812
  - - 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:472
  - - 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:4768
  - - 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:3752
  - - 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:4636

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

00006DFB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006DFB
Size 143KB
SHA256 4b8c5f5c3af71376e17dc2cad149a9c9a216e6d9da2415c1cacf9e96818b506f
MD5 21c6ddf414976ed41b4a40265dd72d1e
SHA1 cd5badb97fd1f59c71dec517370ee79fc9082b9d
SHA512 8bd62b50af87c55ee6a1aee155f2a03ac4972a71fdd5884b3fc6f4674aff4f8777d151c9654dd63253dab4e756e60844d3e4c04c379a1de3cf68af3717046ed1
SSDEEP 3072:lLy2Kerc64CiGImEsXpKK888888888888W88888888888GizGJuud+tfcY:lLy2Kwc64YIZwX888888888888W8888k
TLSH
T1BBE3C60273E71071F9F75A3499760A105E377CB929F2E11A2E30F60E1971AC69DB2B27
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 143KB
SHA256 8acfb30df980ae0b3e88cee00155efd9798d84468cbfc744da79d12ecd9e9f58
MD5 5ffa29ba9d03a59d5d6edaf71cf7aab3
SHA1 64162d5e3c06dbc761aefa391ad70fe8cbeb8898
SHA512 5da207d1bdd4de691a3eb72f0075432b10180d1200d3d23f28f8698ce2e86f1ce935507f134964902f2a23570bea3514eb434ebca928ebabc7669236e347c99d
SSDEEP 3072:lLy2Kerc64CiGImEsXpKK888888888888W88888888888GizGJuud+tfcv:lLy2Kwc64YIZwX888888888888W8888T
TLSH
T17CE3C60273E71071F9F75A3499760A105E377CB929F2E11A2E30F60E1971AC69DB2B27
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2260-12-0x0000000000400000-0x0000000000435000-memory.dmp

Download

memory/4636-15-0x0000000000400000-0x0000000000435000-memory.dmp

Download

memory/4636-16-0x0000000000400000-0x0000000000435000-memory.dmp

Download

memory/4876-0-0x0000000000400000-0x0000000000435000-memory.dmp

Download

memory/4876-9-0x0000000000400000-0x0000000000435000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads