juko | 9881704b26efaf6aa888afc6b18591ac07cd5f28f78a4f78f1f90f7c596a2522

General

Target
2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe
Size 39KB
Sample260502-jsmsrsfs2m
SHA256 9881704b26efaf6aa888afc6b18591ac07cd5f28f78a4f78f1f90f7c596a2522
MD5 a26cf8becbac3231e2b70fadb88de70e
SHA1 ca9ef9b7b3d2875d3c754beb10096a6f19cef279
SHA512 ea6abfeae8d6889b3925010545200c9fe7b36f514001be819439d4f6205e2d4098bc82ac28c2e27adb14ddc0c1895b1d0fdc9b7843861e468cd0ffb25480c8a9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T158036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 8 IoCs

resource	yara_rule
behavioral1/memory/5152-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0006000000023076-5.dat	family_juko
behavioral1/memory/3824-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/5152-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3824-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0008000000024480-16.dat	family_juko
behavioral1/memory/2560-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2560-19-0x0000000000400000-0x000000000041D000-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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-05-02_a26cf8becbac3231e2b70fadb88de70e_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
3824	WINWORD.exe
2560	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-02_a26cf8becbac3231e2b70fadb88de70e_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
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
828	PING.EXE
3224	PING.EXE
1792	PING.EXE
1812	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1792	PING.EXE
828	PING.EXE
3224	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5152 wrote to memory of 3824	5152	2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe	84
PID 3824 wrote to memory of 1812	3824	WINWORD.exe	85
PID 1812 wrote to memory of 828	1812	cmd.exe	87
PID 1812 wrote to memory of 3224	1812	cmd.exe	88
PID 1812 wrote to memory of 1792	1812	cmd.exe	89
PID 1812 wrote to memory of 2560	1812	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-02_a26cf8becbac3231e2b70fadb88de70e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5152
- 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:3824
- - 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\00004490" 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:1812
  - - 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:828
  - - 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:3224
  - - 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:1792
  - - 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:2560

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

00004490

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004490
Size 39KB
SHA256 d9603ca74d89dbccff7e848c728f07af17371fdc8e416207d8d0e29e3fdedefc
MD5 d0ab60482f2ee7715598a8203e7af1ae
SHA1 e7b5fc979e4e10d162c3796963d0f2792c9527cf
SHA512 41a1916f056b27f8434b66b1782cf9f5a830b5064d021586a6ff1a96cdd9615e1a8df78ebb473da4a00c80530196b3337677fc1e7267076a6d114d89eae5ee47
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBE:aLsF2Kerc64sTiX2IV0DVyIGFv
TLSH
T1EB036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 9881704b26efaf6aa888afc6b18591ac07cd5f28f78a4f78f1f90f7c596a2522
MD5 a26cf8becbac3231e2b70fadb88de70e
SHA1 ca9ef9b7b3d2875d3c754beb10096a6f19cef279
SHA512 ea6abfeae8d6889b3925010545200c9fe7b36f514001be819439d4f6205e2d4098bc82ac28c2e27adb14ddc0c1895b1d0fdc9b7843861e468cd0ffb25480c8a9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T158036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2560-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2560-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3824-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3824-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5152-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5152-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads