juko | 66bf191f9433f9f717601c31c41d1b15a71efbb1645abb342ec47194aa985c22

General

Target
2026-08-08_eeec307d367f7a40456a9becfead6785_elex_wannacry.exe
Size 64KB
Sample260809-abbjqser2t
SHA256 66bf191f9433f9f717601c31c41d1b15a71efbb1645abb342ec47194aa985c22
MD5 eeec307d367f7a40456a9becfead6785
SHA1 4484ac19da5dc36c0b31486fef59d4757a276fd5
SHA512 41ab46ad1848105cc3c8e62b64fa15413400d58696746fd378d4bdeb65315eb72cb46a778a247b850063927e0dc87ff725608d9903835f42727b24638be7bcde
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uK:sLy2Kerc64CiGIm8so28K
TLSH
T1CC535C2AA5A220F8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x001000000001122e-4.dat	family_juko
behavioral2/files/0x0009000000016bca-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4844	WINWORD.exe
2900	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-1-5-21-3611646547-550105268-947503007-1000\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
4108	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	2026-08-08_eeec307d367f7a40456a9becfead6785_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
4108	cmd.exe
1404	PING.EXE
5456	PING.EXE
3656	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1404	PING.EXE
5456	PING.EXE
3656	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5608 wrote to memory of 4844	5608	2026-08-08_eeec307d367f7a40456a9becfead6785_elex_wannacry.exe	89
PID 4844 wrote to memory of 4108	4844	WINWORD.exe	90
PID 4108 wrote to memory of 1404	4108	cmd.exe	92
PID 4108 wrote to memory of 5456	4108	cmd.exe	93
PID 4108 wrote to memory of 3656	4108	cmd.exe	94
PID 4108 wrote to memory of 2900	4108	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_eeec307d367f7a40456a9becfead6785_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_eeec307d367f7a40456a9becfead6785_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5608
- 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:4844
- - 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\00003CC0" 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:4108
  - - 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:1404
  - - 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:5456
  - - 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:3656
  - - 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:2900

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

00003CC0

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003CC0
Size 64KB
SHA256 bce98c32bc70a622dbc4bce6ac9ec39e0bbc31b85e23ae204a226d02c307a189
MD5 62c7b498ee61ee89e35ecbcf9817f1e9
SHA1 4a6c73ff249f3d799d1848de4f064078cd127aa9
SHA512 1f2b0bdaec136e04daefe38bee0603b683766ee42cfe824445ea164e165a3aad6d16823e55d980720710533817ad08c0cd1b514b519abd03460ba869a84ec477
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u5:sLy2Kerc64CiGIm8so285
TLSH
T1A9535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 66bf191f9433f9f717601c31c41d1b15a71efbb1645abb342ec47194aa985c22
MD5 eeec307d367f7a40456a9becfead6785
SHA1 4484ac19da5dc36c0b31486fef59d4757a276fd5
SHA512 41ab46ad1848105cc3c8e62b64fa15413400d58696746fd378d4bdeb65315eb72cb46a778a247b850063927e0dc87ff725608d9903835f42727b24638be7bcde
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uK:sLy2Kerc64CiGIm8so28K
TLSH
T1CC535C2AA5A220F8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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