juko | 28f2260b573e0cd522e230f7fbcdcb39f03ec9debe4603dabd6abd1bfbe82966

General

Target
2026-08-03_641d73562bea970e212b450575dc2fcf_elex_wannacry.exe
Size 37KB
Sample260803-ry31yasbma
SHA256 28f2260b573e0cd522e230f7fbcdcb39f03ec9debe4603dabd6abd1bfbe82966
MD5 641d73562bea970e212b450575dc2fcf
SHA1 14e47a2d7d339dd1b52c6cc76bdb9cf33c89e6a2
SHA512 32b041b0646aa3bc391e631b17b452a681895e6b0b0401bae8d10645a61faffad4cd550d6cf665b42b9713684de0ccf9fc12a3275a6d4332791dba9952365a7d
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa0:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T1C2035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5256-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cc9-5.dat	family_juko
behavioral2/memory/5256-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1392-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c620-13.dat	family_juko
behavioral2/memory/1312-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1312-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1392	WINWORD.exe
1312	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
1288	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-03_641d73562bea970e212b450575dc2fcf_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

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
2516	PING.EXE
5212	PING.EXE
1288	cmd.exe
2856	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2516	PING.EXE
5212	PING.EXE
2856	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5256 wrote to memory of 1392	5256	2026-08-03_641d73562bea970e212b450575dc2fcf_elex_wannacry.exe	88
PID 1392 wrote to memory of 1288	1392	WINWORD.exe	89
PID 1288 wrote to memory of 2856	1288	cmd.exe	91
PID 1288 wrote to memory of 2516	1288	cmd.exe	92
PID 1288 wrote to memory of 5212	1288	cmd.exe	93
PID 1288 wrote to memory of 1312	1288	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-03_641d73562bea970e212b450575dc2fcf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_641d73562bea970e212b450575dc2fcf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5256
- 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:1392
- - 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\00000D5B" 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:1288
  - - 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:2856
  - - 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:2516
  - - 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:5212
  - - 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:1312

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

00000D5B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D5B
Size 37KB
SHA256 005d5fa3d1ff5035b4384d0e6f245b79eaaa4151fb15db82ceda7c75b0e4444a
MD5 fa97ff2e9406706e71e24fdaede32f46
SHA1 831e45a674ca3c73ed5d43b73287808a93fb9248
SHA512 ee882c6855f82bcc439faa620217a80479255f2b34ad0c2a270e2dbb384e0b72039ee8b09fbcd756b786abadce80cd8e9e87a7e03300d43443062966da464114
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaU:3LsF2Kerc64sTiX2IV0Dhuogw/
TLSH
T10C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB066F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 28f2260b573e0cd522e230f7fbcdcb39f03ec9debe4603dabd6abd1bfbe82966
MD5 641d73562bea970e212b450575dc2fcf
SHA1 14e47a2d7d339dd1b52c6cc76bdb9cf33c89e6a2
SHA512 32b041b0646aa3bc391e631b17b452a681895e6b0b0401bae8d10645a61faffad4cd550d6cf665b42b9713684de0ccf9fc12a3275a6d4332791dba9952365a7d
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa0:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T1C2035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1312-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1312-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1392-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5256-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5256-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads