juko | 8019180c283b91fc8217674c58c202d2715a564d7b3c2dc372d00b81505c0113

General

Target
2026-08-12_eb10d656962d955fbaee76129829fb14_elex_wannacry.exe
Size 39KB
Sample260812-gra2gabk8x
SHA256 8019180c283b91fc8217674c58c202d2715a564d7b3c2dc372d00b81505c0113
MD5 eb10d656962d955fbaee76129829fb14
SHA1 6f5cb1e5845adadfdc0ce32c5589ad499f6ef845
SHA512 2f5be3c401d771f95675fdd8f09e443b17806fe2c761ac0d0aa1d59786fa9a48a930ffbeb5018a142f7e38008843c6ac1e86a0e1ce3c346e397b5a92ba12c746
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBn:aLsF2Kerc64sTiX2IV0DVyIGFQ
TLSH
T187036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1452-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b1e8-5.dat	family_juko
behavioral2/memory/1452-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4564-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c469-13.dat	family_juko
behavioral2/memory/4340-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4340-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4564	WINWORD.exe
4340	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
4100	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-12_eb10d656962d955fbaee76129829fb14_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

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
4100	cmd.exe
1276	PING.EXE
3892	PING.EXE
3272	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3892	PING.EXE
3272	PING.EXE
1276	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1452 wrote to memory of 4564	1452	2026-08-12_eb10d656962d955fbaee76129829fb14_elex_wannacry.exe	89
PID 4564 wrote to memory of 4100	4564	WINWORD.exe	90
PID 4100 wrote to memory of 1276	4100	cmd.exe	92
PID 4100 wrote to memory of 3892	4100	cmd.exe	93
PID 4100 wrote to memory of 3272	4100	cmd.exe	94
PID 4100 wrote to memory of 4340	4100	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-12_eb10d656962d955fbaee76129829fb14_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_eb10d656962d955fbaee76129829fb14_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1452
- 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:4564
- - 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\00003691" 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:4100
  - - 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:1276
  - - 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:3892
  - - 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:3272
  - - 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:4340

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

00003691

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003691
Size 39KB
SHA256 4cece71736bfabeee44f2cf18ef2203e9c074dd90a45541b9ccbad4f565ae883
MD5 10b7b96e9c34670a4cf771c1d27ddbd2
SHA1 f2516c9b262428cdc1a8b3a195c7e844cb36075e
SHA512 979f054f285dbf33fc598f0e0523bb83e1db690245fbed4c8248352e777331593dac462776b09aa08885e647ab1c1cc508c288ae6eddf46e768b044deead1bb0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBf:aLsF2Kerc64sTiX2IV0DVyIGFw
TLSH
T1AD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 8019180c283b91fc8217674c58c202d2715a564d7b3c2dc372d00b81505c0113
MD5 eb10d656962d955fbaee76129829fb14
SHA1 6f5cb1e5845adadfdc0ce32c5589ad499f6ef845
SHA512 2f5be3c401d771f95675fdd8f09e443b17806fe2c761ac0d0aa1d59786fa9a48a930ffbeb5018a142f7e38008843c6ac1e86a0e1ce3c346e397b5a92ba12c746
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBn:aLsF2Kerc64sTiX2IV0DVyIGFQ
TLSH
T187036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1452-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1452-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4340-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4340-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4564-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads