juko | db7cb5f683d0412652ba9f59f6553e47971f47aa7f9f97a9c03b13f51243e33d

General

Target
2026-08-22_386f550a768313b76abda0fdcf3dc753_elex_wannacry.exe
Size 49KB
Sample260823-lze3lsvhnb
SHA256 db7cb5f683d0412652ba9f59f6553e47971f47aa7f9f97a9c03b13f51243e33d
MD5 386f550a768313b76abda0fdcf3dc753
SHA1 a248e5c0967025ffbe1cd4f59249c2447f081912
SHA512 0e79b1b4dea46a9f91786444461806ce6cd4360b219c824193ec34dfebd901ca9f324da6497f7848c3b5086edc019612d13568082de6a9427bb88aa8330b670e
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:4Ly2Kerc64CiGImVu8p4kojWh2I
TLSH
T17E334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3632-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000900000001b1d0-5.dat	family_juko
behavioral2/memory/3632-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4036-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c646-13.dat	family_juko
behavioral2/memory/5108-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5108-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4036	WINWORD.exe
5108	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
4236	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-22_386f550a768313b76abda0fdcf3dc753_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

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
3440	PING.EXE
2236	PING.EXE
4236	cmd.exe
5312	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5312	PING.EXE
3440	PING.EXE
2236	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3632 wrote to memory of 4036	3632	2026-08-22_386f550a768313b76abda0fdcf3dc753_elex_wannacry.exe	88
PID 4036 wrote to memory of 4236	4036	WINWORD.exe	89
PID 4236 wrote to memory of 5312	4236	cmd.exe	91
PID 4236 wrote to memory of 3440	4236	cmd.exe	92
PID 4236 wrote to memory of 2236	4236	cmd.exe	93
PID 4236 wrote to memory of 5108	4236	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-22_386f550a768313b76abda0fdcf3dc753_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_386f550a768313b76abda0fdcf3dc753_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3632
- 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:4036
- - 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\00005314" 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:4236
  - - 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:5312
  - - 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:3440
  - - 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:2236
  - - 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:5108

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

00005314

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005314
Size 49KB
SHA256 1ad1637547918bcf80e08f4031f663a1359a5560d44207f0110b13bb69baf2af
MD5 83c9f7a59bd9e6ffb2620a0ceb6156b2
SHA1 787e74034d5f4e8103cf816e3fe978852f3152f8
SHA512 2ef259d1cd623379b5569030860cec364b45820ee73b333a3303aec1dc974bd066ed28b966dabd8e82d676fea06ae5858ddd5502ccaf27b30f5ff0e0fad30c9e
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2H:4Ly2Kerc64CiGImVu8p4kojWh2H
TLSH
T1AF334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 db7cb5f683d0412652ba9f59f6553e47971f47aa7f9f97a9c03b13f51243e33d
MD5 386f550a768313b76abda0fdcf3dc753
SHA1 a248e5c0967025ffbe1cd4f59249c2447f081912
SHA512 0e79b1b4dea46a9f91786444461806ce6cd4360b219c824193ec34dfebd901ca9f324da6497f7848c3b5086edc019612d13568082de6a9427bb88aa8330b670e
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:4Ly2Kerc64CiGImVu8p4kojWh2I
TLSH
T17E334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3632-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3632-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4036-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5108-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5108-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads