juko | a1ac6c03b786093e52404a670a94b9dab7b3058008eb307003ddf0bf987183a1

General

Target
2026-08-01_5ba393cb51396fe3a8a76fde337d4de2_elex_wannacry.exe
Size 39KB
Sample260802-a1azhazzev
SHA256 a1ac6c03b786093e52404a670a94b9dab7b3058008eb307003ddf0bf987183a1
MD5 5ba393cb51396fe3a8a76fde337d4de2
SHA1 b2e458115674010e5afb8c2092cce956661ff0e2
SHA512 9d23ff7e25360e09e8664708ee1481bb5c2988a2d223a975c73407fbd5e107405a35f05c48b500a489f7c1d973508fdab2344975f2adab9562df0f6d55be77c1
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB5:aLsF2Kerc64sTiX2IV0DVyIGFy
TLSH
T18F036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3472-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-4.dat	family_juko
behavioral2/memory/3472-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4224-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/5392-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5392-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4224	WINWORD.exe
5392	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5008	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_5ba393cb51396fe3a8a76fde337d4de2_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
5008	cmd.exe
564	PING.EXE
4312	PING.EXE
4928	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4928	PING.EXE
564	PING.EXE
4312	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3472 wrote to memory of 4224	3472	2026-08-01_5ba393cb51396fe3a8a76fde337d4de2_elex_wannacry.exe	89
PID 4224 wrote to memory of 5008	4224	WINWORD.exe	90
PID 5008 wrote to memory of 564	5008	cmd.exe	92
PID 5008 wrote to memory of 4312	5008	cmd.exe	93
PID 5008 wrote to memory of 4928	5008	cmd.exe	94
PID 5008 wrote to memory of 5392	5008	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_5ba393cb51396fe3a8a76fde337d4de2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_5ba393cb51396fe3a8a76fde337d4de2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3472
- 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:4224
- - 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\000040BB" 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:5008
  - - 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:564
  - - 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:4312
  - - 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:4928
  - - 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:5392

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

000040BB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040BB
Size 39KB
SHA256 e16a4ef57483683878c84a7264949367bcc3143b4d4488c080b98ec651e3ec5c
MD5 64858a3f0be9f04a25b8ba9eb837834c
SHA1 5fa00699080432330b31a5c0c760ca626b09d589
SHA512 a8fa0b69e6e45ab76379c8f81b50e83257f103d098a51c03ef60478e50551bb9c4627d38d578ecd46da1c70841d93563ad072534af536c49a7b90e50a75edded
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB/:aLsF2Kerc64sTiX2IV0DVyIGFQ
TLSH
T1C2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 a1ac6c03b786093e52404a670a94b9dab7b3058008eb307003ddf0bf987183a1
MD5 5ba393cb51396fe3a8a76fde337d4de2
SHA1 b2e458115674010e5afb8c2092cce956661ff0e2
SHA512 9d23ff7e25360e09e8664708ee1481bb5c2988a2d223a975c73407fbd5e107405a35f05c48b500a489f7c1d973508fdab2344975f2adab9562df0f6d55be77c1
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB5:aLsF2Kerc64sTiX2IV0DVyIGFy
TLSH
T18F036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3472-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3472-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4224-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5392-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5392-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads