juko | 01ec37e63e56b3825e008bc945e9efc9ac1c9b6c8524bc63c2ef40adea9c0969

General

Target
2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe
Size 39KB
Sample260517-rdpb2sc18j
SHA256 01ec37e63e56b3825e008bc945e9efc9ac1c9b6c8524bc63c2ef40adea9c0969
MD5 b106e4d51ea41be0ba80dd1c2b5ebcee
SHA1 3754f45e442ae5d94b2f5a8746e5243c2bfddaea
SHA512 be5407b579a9f123685a7ee4998e38dfac0f5bf5eb27352387e7349d6f9d81b16b94c6bf8cf61c55c35346c4bdfa001d2fc3fa207877cde2c7e6bd4bffed88ac
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBh:aLsF2Kerc64sTiX2IV0DVyIGFC
TLSH
T1DF036B1B2964B062C69611B0F8696F34C03D9DB4052BF052F7447B992CB6DA3DF71ACE
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/4788-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00250000000242e9-5.dat	family_juko
behavioral1/memory/4788-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3500-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000a00000002434a-15.dat	family_juko
behavioral1/memory/368-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/368-18-0x0000000000400000-0x000000000041D000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3500	WINWORD.exe
368	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-1-5-21-1074038928-2032447174-945360078-1000\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	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	2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_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
4820	cmd.exe
2396	PING.EXE
4048	PING.EXE
4576	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4576	PING.EXE
2396	PING.EXE
4048	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 3500	4788	2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe	88
PID 3500 wrote to memory of 4820	3500	WINWORD.exe	89
PID 4820 wrote to memory of 2396	4820	cmd.exe	91
PID 4820 wrote to memory of 4048	4820	cmd.exe	93
PID 4820 wrote to memory of 4576	4820	cmd.exe	95
PID 4820 wrote to memory of 368	4820	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_b106e4d51ea41be0ba80dd1c2b5ebcee_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4788
- 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:3500
- - 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\00003618" 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:4820
  - - 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:2396
  - - 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:4048
  - - 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:4576
  - - 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:368

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

00003618

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003618
Size 39KB
SHA256 4a02adf2b47c2c31b9384c8b627261ae2d464a1e358ab97670af6928be2717c2
MD5 8d67c571f9e29b0fad5214098dc7b7f0
SHA1 95b2a11e4dd15284a56afab882dce16944ba64cb
SHA512 6d7a2c6a11bda7336033bf6cb6a8f88d13c6a68803d7ca9e8e490154147b7569ce2ac0b43246f5916318ff418752ee8c2eab53c606122a8a2ac8d46517aaa525
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBb:aLsF2Kerc64sTiX2IV0DVyIGFU
TLSH
T1EA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 01ec37e63e56b3825e008bc945e9efc9ac1c9b6c8524bc63c2ef40adea9c0969
MD5 b106e4d51ea41be0ba80dd1c2b5ebcee
SHA1 3754f45e442ae5d94b2f5a8746e5243c2bfddaea
SHA512 be5407b579a9f123685a7ee4998e38dfac0f5bf5eb27352387e7349d6f9d81b16b94c6bf8cf61c55c35346c4bdfa001d2fc3fa207877cde2c7e6bd4bffed88ac
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBh:aLsF2Kerc64sTiX2IV0DVyIGFC
TLSH
T1DF036B1B2964B062C69611B0F8696F34C03D9DB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/368-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/368-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3500-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4788-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4788-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads