juko | c841e4f24ede5a5c34e390818ded57739ebcfe7c7cbabd94a539ff8f6b5dc3c4

General

Target
2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe
Size 57KB
Sample260416-qbppcsf19q
SHA256 c841e4f24ede5a5c34e390818ded57739ebcfe7c7cbabd94a539ff8f6b5dc3c4
MD5 5bbb15624bedf022087e52ee5489ac32
SHA1 96282f22c81e05f162da78163f1ed313524b8f6b
SHA512 ac2fafaf935b9cd8ca7cfd75c48c40ea7f8c8d1d9926e9a91c3526f9b7bc4aebc4a885a9155c0a0414b9cda4bb6f66ba414e725ae94b65fe915c54efb50c7045
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa2:wLy2Kerc64CiGImEsoDfa2
TLSH
T12F433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
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 7 IoCs

resource	yara_rule
behavioral1/memory/5020-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x000d00000001f0ad-5.dat	family_juko
behavioral1/memory/5020-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/4884-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x000900000002449d-15.dat	family_juko
behavioral1/memory/5072-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/5072-18-0x0000000000400000-0x000000000041F000-memory.dmp	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	2026-04-16_5bbb15624bedf022087e52ee5489ac32_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
4884	WINWORD.exe
5072	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-16_5bbb15624bedf022087e52ee5489ac32_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
4864	cmd.exe
5084	PING.EXE
4072	PING.EXE
3852	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5084	PING.EXE
4072	PING.EXE
3852	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5020 wrote to memory of 4884	5020	2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe	84
PID 4884 wrote to memory of 4864	4884	WINWORD.exe	85
PID 4864 wrote to memory of 5084	4864	cmd.exe	87
PID 4864 wrote to memory of 4072	4864	cmd.exe	88
PID 4864 wrote to memory of 3852	4864	cmd.exe	89
PID 4864 wrote to memory of 5072	4864	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_5bbb15624bedf022087e52ee5489ac32_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5020
- 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:4884
- - 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\00004D56" 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:4864
  - - 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:5084
  - - 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:4072
  - - 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:3852
  - - 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:5072

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

00004D56

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004D56
Size 57KB
SHA256 b5b9edf1a62f7c76666d5320516ce9d76b3f3c876534639b75de8d15043edec6
MD5 1b7dab1d8240ad17cbd5fa28bc69d4f6
SHA1 ff07b89f7e5dd2201f37965891d86d651e1eb470
SHA512 2a4139739c7c5ddbd7ab8d62fda37c55b59c9c86bfebc839e289605ae7b78fb4b577d4684954ce3e5255d122778a0f2884e0bbd95cc6da18104de0dec47984dc
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaI:wLy2Kerc64CiGImEsoDfaI
TLSH
T1AE433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 c841e4f24ede5a5c34e390818ded57739ebcfe7c7cbabd94a539ff8f6b5dc3c4
MD5 5bbb15624bedf022087e52ee5489ac32
SHA1 96282f22c81e05f162da78163f1ed313524b8f6b
SHA512 ac2fafaf935b9cd8ca7cfd75c48c40ea7f8c8d1d9926e9a91c3526f9b7bc4aebc4a885a9155c0a0414b9cda4bb6f66ba414e725ae94b65fe915c54efb50c7045
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa2:wLy2Kerc64CiGImEsoDfa2
TLSH
T12F433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4884-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5020-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5020-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5072-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5072-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads