juko | 89934275def9dbca039ce1f1ffbb0aa951bcadae625b5e71d7e79df1d30f58e5

General

Target
2026-10-26_a38962a67bdfbc576633ac0c14bfcf5a_elex_wannacry.exe
Size 39KB
Sample261027-mbrbeadc23
SHA256 89934275def9dbca039ce1f1ffbb0aa951bcadae625b5e71d7e79df1d30f58e5
MD5 a38962a67bdfbc576633ac0c14bfcf5a
SHA1 f951972b8de2a176f2891c03c1eed75f7ed8fa68
SHA512 d0de92817a074679cb76d0fcbf77e2972f2a0de98ef494a0bb35718136014d1d884a36f8ebf0e1e2a17992293af4634cb0ba90176bbe14c27cdb72f89e8364d2
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpNa0dX60a5ywai:OLsF2Kerc64sTiX2IV0DhuPoTgwv
TLSH
T1C3037C1B695560A3C59711B0E5E81FB5843D8CB2046BB062FB40BA5998B3CD3DF72BCE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000800000001b85a-3.dat	family_juko
behavioral2/files/0x00030000000170ef-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5752	WINWORD.exe
4552	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-1-5-21-1404337215-1550464601-2805570857-1000\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
1896	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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	2026-10-26_a38962a67bdfbc576633ac0c14bfcf5a_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1896	cmd.exe
5964	PING.EXE
4476	PING.EXE
4212	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4212	PING.EXE
5964	PING.EXE
4476	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5784 wrote to memory of 5752	5784	2026-10-26_a38962a67bdfbc576633ac0c14bfcf5a_elex_wannacry.exe	88
PID 5752 wrote to memory of 1896	5752	WINWORD.exe	89
PID 1896 wrote to memory of 5964	1896	cmd.exe	91
PID 1896 wrote to memory of 4476	1896	cmd.exe	92
PID 1896 wrote to memory of 4212	1896	cmd.exe	93
PID 1896 wrote to memory of 4552	1896	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-26_a38962a67bdfbc576633ac0c14bfcf5a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_a38962a67bdfbc576633ac0c14bfcf5a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5784
- 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:5752
- - 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\00007BBB" 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:1896
  - - 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:5964
  - - 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:4476
  - - 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:4212
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4552

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00007BBB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007BBB
Size 39KB
SHA256 8126d15023b58be141e7acee2627fec968dfacdbb63dd71660f2cc2ef272e285
MD5 af72af46c3074e0b4e8d76c17cb6f270
SHA1 00b249028b689e758849db4a11e657df7a538b9a
SHA512 fa586e26d5c7f1b956b1aad3b09f5a34ea92736ed52e40ade201cd5a2c9244b1150af6465adfcc7b8c588ae443edcaa1d6ec66e24034bb362fe0feb6f428f701
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpNa0dX60a5ywaq:OLsF2Kerc64sTiX2IV0DhuPoTgw/
TLSH
T134037C1B695560A3C59711B0E5E81FB5843D8CB2046BB062FB40BA5998B3CD3DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 89934275def9dbca039ce1f1ffbb0aa951bcadae625b5e71d7e79df1d30f58e5
MD5 a38962a67bdfbc576633ac0c14bfcf5a
SHA1 f951972b8de2a176f2891c03c1eed75f7ed8fa68
SHA512 d0de92817a074679cb76d0fcbf77e2972f2a0de98ef494a0bb35718136014d1d884a36f8ebf0e1e2a17992293af4634cb0ba90176bbe14c27cdb72f89e8364d2
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpNa0dX60a5ywai:OLsF2Kerc64sTiX2IV0DhuPoTgwv
TLSH
T1C3037C1B695560A3C59711B0E5E81FB5843D8CB2046BB062FB40BA5998B3CD3DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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