juko | a4028e747e0af13022896c8e4ed83d8ee2e6cce8e1864a010412c13f7d3f3222

General

Target
2026-08-19_6d5b00727a37b6e5feeacf8ccb9976ed_elex_wannacry.exe
Size 49KB
Sample260820-akxtbsck7v
SHA256 a4028e747e0af13022896c8e4ed83d8ee2e6cce8e1864a010412c13f7d3f3222
MD5 6d5b00727a37b6e5feeacf8ccb9976ed
SHA1 7b55e0d70c8ac6e9b073807b4f21ac7785d7d48b
SHA512 a109689fdea621cd90dd5b437cfbb4417ad7f815651abc827303244173eafeed9f954ebc41144386451a9a7412ccb866e2ab9da8cc7a1edbadec467bcf6ba222
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:4Ly2Kerc64CiGImVu8p4kojWh2I
TLSH
T1E7334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4116-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001200000001122a-5.dat	family_juko
behavioral2/memory/4116-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4860-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c468-13.dat	family_juko
behavioral2/memory/5168-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5168-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4860	WINWORD.exe
5168	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-1-5-21-2301830172-776172150-2531349243-1000\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
5092	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	2026-08-19_6d5b00727a37b6e5feeacf8ccb9976ed_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
5092	cmd.exe
6072	PING.EXE
3816	PING.EXE
5032	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6072	PING.EXE
3816	PING.EXE
5032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4116 wrote to memory of 4860	4116	2026-08-19_6d5b00727a37b6e5feeacf8ccb9976ed_elex_wannacry.exe	89
PID 4860 wrote to memory of 5092	4860	WINWORD.exe	90
PID 5092 wrote to memory of 6072	5092	cmd.exe	92
PID 5092 wrote to memory of 3816	5092	cmd.exe	93
PID 5092 wrote to memory of 5032	5092	cmd.exe	94
PID 5092 wrote to memory of 5168	5092	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-19_6d5b00727a37b6e5feeacf8ccb9976ed_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_6d5b00727a37b6e5feeacf8ccb9976ed_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4116
- 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:4860
- - 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\000070BB" 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:5092
  - - 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:6072
  - - 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:3816
  - - 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:5032
  - - 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:5168

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

000070BB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000070BB
Size 49KB
SHA256 1660ea57a6e9053102abbd5ec064b2a5b472e62661755732208ef985e9a84443
MD5 a8d68c4ab6c2ca2ea3e1863ad3a89b8a
SHA1 cbd017a28169257608422d9ef30eb64c23237e2e
SHA512 0be7fd4a9a3cce7f403c208233dabe1570f540470d5b6b6d075f6f3f10c41d36c7222cce8e20dd388d7578dd41efe2f9058d8d049ede44bfb094f181e96603ab
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h24:4Ly2Kerc64CiGImVu8p4kojWh24
TLSH
T1E6334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 a4028e747e0af13022896c8e4ed83d8ee2e6cce8e1864a010412c13f7d3f3222
MD5 6d5b00727a37b6e5feeacf8ccb9976ed
SHA1 7b55e0d70c8ac6e9b073807b4f21ac7785d7d48b
SHA512 a109689fdea621cd90dd5b437cfbb4417ad7f815651abc827303244173eafeed9f954ebc41144386451a9a7412ccb866e2ab9da8cc7a1edbadec467bcf6ba222
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:4Ly2Kerc64CiGImVu8p4kojWh2I
TLSH
T1E7334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4116-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4116-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4860-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5168-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5168-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads