juko | edf5d96519c49c0d7d99930db2295b421f38a5e4cc515f913cd302a9207399c3

General

Target
2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe
Size 30KB
Sample260822-aecafazakd
SHA256 edf5d96519c49c0d7d99930db2295b421f38a5e4cc515f913cd302a9207399c3
MD5 f4856fc094767fd33d184e82b64b368b
SHA1 0e2cb47d7af60ed3db9ee235464250e4136afc4f
SHA512 1da94a0e7df9817971416fda3a9257d5f410bbbf1df951924a5b902e4312bf7260eee1efd46fd270dbec6da419432fbc60a72495f628ed3f05471f79ba7a1034
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXQ:tLsF2Kerc64sTiX2IV0DzloQ
TLSH
T1F5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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
behavioral1/files/0x0033000000023aa5-4.dat	family_juko
behavioral1/files/0x0009000000024659-9.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3084	WINWORD.exe
2196	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-1-5-21-3053180483-1881419501-3594244048-1000\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
2816	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	2026-08-21_f4856fc094767fd33d184e82b64b368b_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
2816	cmd.exe
6080	PING.EXE
556	PING.EXE
4804	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6080	PING.EXE
556	PING.EXE
4804	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4776 wrote to memory of 3084	4776	2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe	86
PID 3084 wrote to memory of 2816	3084	WINWORD.exe	87
PID 2816 wrote to memory of 6080	2816	cmd.exe	89
PID 2816 wrote to memory of 556	2816	cmd.exe	91
PID 2816 wrote to memory of 4804	2816	cmd.exe	92
PID 2816 wrote to memory of 2196	2816	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-21_f4856fc094767fd33d184e82b64b368b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4776
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3084
- - 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\00006B63" 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:2816
  - - 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:6080
  - - 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:556
  - - 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:4804
  - - 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:2196

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00006B63

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006B63
Size 30KB
SHA256 30bccbc0632ffbdf4f62c3c1475d7f6fb1df263773d3eb7a1a92a971effab0c9
MD5 07c6944088a83b88430f8d571f740890
SHA1 add7764494763d592a3a7971164a384c31e63882
SHA512 606b577210a81e4c291c3ac91baaa866440f9c1d11e222cc82181f2b725964340cac38d99158edfd5c2ffacd57eece72f97fcb3c3abdd4afed91412f98af7808
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXl:tLsF2Kerc64sTiX2IV0Dzlol
TLSH
T198E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 edf5d96519c49c0d7d99930db2295b421f38a5e4cc515f913cd302a9207399c3
MD5 f4856fc094767fd33d184e82b64b368b
SHA1 0e2cb47d7af60ed3db9ee235464250e4136afc4f
SHA512 1da94a0e7df9817971416fda3a9257d5f410bbbf1df951924a5b902e4312bf7260eee1efd46fd270dbec6da419432fbc60a72495f628ed3f05471f79ba7a1034
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXQ:tLsF2Kerc64sTiX2IV0DzloQ
TLSH
T1F5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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