juko | 991c2014f341e04d78b2fef12c8e611648134610d3e6eb93f87f36529b00ea92

General

Target
2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe
Size 105KB
Sample260417-rwb5facv5v
SHA256 991c2014f341e04d78b2fef12c8e611648134610d3e6eb93f87f36529b00ea92
MD5 1eeefded5a6e0c5c1d0e7b637e102da0
SHA1 48d2ce244c437e99030dd84e959107bcd0fb17b1
SHA512 8fa6c7df4eee3f62cc337f706897d749b755a08fa2c5786d6ac559305a2b531b11bc5c000033c1b67d37ab56c9e539dac219a426e90d6a68ef3f1c407359ebbb
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHF5:XLsF2Kerc64sTiX2IV0DpK5
TLSH
T190B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x000900000002444d-4.dat	family_juko
behavioral1/files/0x0008000000024452-14.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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4540	WINWORD.exe
3536	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-1-5-21-721190819-434563495-2007910846-1000\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

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.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
4508	cmd.exe
4676	PING.EXE
3476	PING.EXE
5216	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4676	PING.EXE
3476	PING.EXE
5216	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5588 wrote to memory of 4540	5588	2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe	84
PID 4540 wrote to memory of 4508	4540	WINWORD.exe	85
PID 4508 wrote to memory of 4676	4508	cmd.exe	87
PID 4508 wrote to memory of 3476	4508	cmd.exe	88
PID 4508 wrote to memory of 5216	4508	cmd.exe	89
PID 4508 wrote to memory of 3536	4508	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5588
- 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:4540
- - 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\00005427" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4508
  - - 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:4676
  - - 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:3476
  - - 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:5216
  - - 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:3536

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00005427

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005427
Size 105KB
SHA256 99ebf615a4fc37f4378c4e7924cc61ca0f3019b259e7c4dcf57a415dc95fef45
MD5 d0224c9ad94270c5c20ed76e8d7471c8
SHA1 b84bbe013c889c2ea780e803a4239708afba7194
SHA512 d91cad9b9cda9ebc17019d2f369034048e8834288412c8329e963404de675768153fac441c0809f559061f1e86e02acd563d291d78a4c77bf56e1166cf111af2
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHF1:XLsF2Kerc64sTiX2IV0DpK1
TLSH
T1C6B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 105KB
SHA256 991c2014f341e04d78b2fef12c8e611648134610d3e6eb93f87f36529b00ea92
MD5 1eeefded5a6e0c5c1d0e7b637e102da0
SHA1 48d2ce244c437e99030dd84e959107bcd0fb17b1
SHA512 8fa6c7df4eee3f62cc337f706897d749b755a08fa2c5786d6ac559305a2b531b11bc5c000033c1b67d37ab56c9e539dac219a426e90d6a68ef3f1c407359ebbb
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHF5:XLsF2Kerc64sTiX2IV0DpK5
TLSH
T190B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3536-17-0x0000000002AB0000-0x0000000002AB7000-memory.dmp

Download

memory/3536-16-0x0000000002550000-0x00000000025AF000-memory.dmp

Download

memory/4540-13-0x00000000024C0000-0x000000000251F000-memory.dmp

Download

memory/5588-10-0x00000000024A0000-0x00000000024FF000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads