juko | 03e33cfeb8576a70f8611111e4b8450ca8e83e42ed36718e3dec4f98bed801e7

General

Target
2026-08-02_6e034ff00950c528f03c74f7aad5c366_elex_wannacry.exe
Size 39KB
Sample260802-kfbqeayeqg
SHA256 03e33cfeb8576a70f8611111e4b8450ca8e83e42ed36718e3dec4f98bed801e7
MD5 6e034ff00950c528f03c74f7aad5c366
SHA1 c790cd5be3d2285c80652f06dbcfd15be2d8fcab
SHA512 280ac16668b2173895c15efeebc72953956b5a4af0b634dfc20823a672f547f0c88c2b4303e90d876fe641a98079565b440eadb37e576135d159dde42d3dd81e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB9:aLsF2Kerc64sTiX2IV0DVyIGFu
TLSH
T11E036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 7 IoCs

resource	yara_rule
behavioral2/memory/1812-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000c00000001136a-5.dat	family_juko
behavioral2/memory/1812-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3076-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cd6-13.dat	family_juko
behavioral2/memory/4792-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4792-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3076	WINWORD.exe
4792	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-1-5-21-552508041-2681165170-3229858294-1000\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
4484	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_6e034ff00950c528f03c74f7aad5c366_elex_wannacry.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
4484	cmd.exe
3184	PING.EXE
4536	PING.EXE
1108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4536	PING.EXE
1108	PING.EXE
3184	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1812 wrote to memory of 3076	1812	2026-08-02_6e034ff00950c528f03c74f7aad5c366_elex_wannacry.exe	89
PID 3076 wrote to memory of 4484	3076	WINWORD.exe	90
PID 4484 wrote to memory of 3184	4484	cmd.exe	92
PID 4484 wrote to memory of 4536	4484	cmd.exe	93
PID 4484 wrote to memory of 1108	4484	cmd.exe	94
PID 4484 wrote to memory of 4792	4484	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_6e034ff00950c528f03c74f7aad5c366_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_6e034ff00950c528f03c74f7aad5c366_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1812
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3076
- - 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\00002941" 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:4484
  - - 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:3184
  - - 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:4536
  - - 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:1108
  - - 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:4792

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00002941

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002941
Size 39KB
SHA256 6000adae95364a9628281a6238e8aa75258e205266e02e946953aded047c5a84
MD5 afa1461abb08c0f6a63179108d39e382
SHA1 fb244d91b02f5c2b538eebaed9e20bf17413ddc9
SHA512 1ab6cf62800f2b28ac9d2241428f4efd4ccdbfa8a25c3d52c12d9d576968ac76ad27c39d07177f3a713441d33a6dec379cfd8ee1e013b7f6424750806f624bc5
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB/:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T1BC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 03e33cfeb8576a70f8611111e4b8450ca8e83e42ed36718e3dec4f98bed801e7
MD5 6e034ff00950c528f03c74f7aad5c366
SHA1 c790cd5be3d2285c80652f06dbcfd15be2d8fcab
SHA512 280ac16668b2173895c15efeebc72953956b5a4af0b634dfc20823a672f547f0c88c2b4303e90d876fe641a98079565b440eadb37e576135d159dde42d3dd81e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB9:aLsF2Kerc64sTiX2IV0DVyIGFu
TLSH
T11E036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1812-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1812-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3076-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4792-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4792-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads