Overview

overview

10

Static

static

download.exe

windows7_x64

10

download.exe

windows10_x64

10

Analysis

  • max time kernel
    146s
  • max time network
    133s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    20-04-2021 09:05

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General

  • Target

    download.exe

  • Size

    882KB

  • MD5

    c65ce4ba6d977022056272ffc86f51d4

  • SHA1

    3811485a7d4ad5f551d844b81e15f44f00515cba

  • SHA256

    194d34ae7ddcfa9918c1230cda4615d275baf0bb1a2bb2e0c2c5fb70a87ff4fa

  • SHA512

    7792da612d84add79a3972f72a9580ab6a72e9624de43d708cf014d391ead9c415b7362853c18b6a855960bb000928a850b71f9a966575db9c2650094edf38d7

Score
10/10
evasionpersistenceransomwaretrojan

Malware Config

Signatures

  • UAC bypass 3 TTPs
    evasiontrojan
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 10 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Adds Run key to start application 2 TTPs 4 IoCs
    persistence
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
    evasiontrojan
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Interacts with shadow copies 2 TTPs 3 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • System policy modification 1 TTPs 3 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\download.exe
    "C:\Users\Admin\AppData\Local\Temp\download.exe"
    1⤵
    • Modifies extensions of user files
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:344
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:924
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1072
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:900
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1524
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:740
    • C:\Windows\SysWOW64\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:1904
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1264
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {F40F1A88-5BD0-4FEF-9566-A47E61FC3502} S-1-5-21-2455352368-1077083310-2879168483-1000:QWOCTUPM\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:864
    • C:\Users\Admin\AppData\Roaming\Microsoft\download.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\download.exe
      2⤵
      • Executes dropped EXE
      PID:1352

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1
T1060

Privilege Escalation

Bypass User Account Control

1
T1088

Defense Evasion

Bypass User Account Control

1
T1088

Disabling Security Tools

1
T1089

Modify Registry

3
T1112

File Deletion

2
T1107

Credential Access

Discovery

System Information Discovery

3
T1082

Query Registry

1
T1012

Peripheral Device Discovery

1
T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Inhibit System Recovery

2
T1490

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\Microsoft\download.exe
    MD5

    c65ce4ba6d977022056272ffc86f51d4

    SHA1

    3811485a7d4ad5f551d844b81e15f44f00515cba

    SHA256

    194d34ae7ddcfa9918c1230cda4615d275baf0bb1a2bb2e0c2c5fb70a87ff4fa

    SHA512

    7792da612d84add79a3972f72a9580ab6a72e9624de43d708cf014d391ead9c415b7362853c18b6a855960bb000928a850b71f9a966575db9c2650094edf38d7

    Download Submit
  • C:\Users\Admin\AppData\Roaming\Microsoft\download.exe
    MD5

    c65ce4ba6d977022056272ffc86f51d4

    SHA1

    3811485a7d4ad5f551d844b81e15f44f00515cba

    SHA256

    194d34ae7ddcfa9918c1230cda4615d275baf0bb1a2bb2e0c2c5fb70a87ff4fa

    SHA512

    7792da612d84add79a3972f72a9580ab6a72e9624de43d708cf014d391ead9c415b7362853c18b6a855960bb000928a850b71f9a966575db9c2650094edf38d7

    Download Submit
  • memory/344-61-0x0000000001B50000-0x0000000001C69000-memory.dmp
    Filesize

    1.1MB

    Download
  • memory/344-62-0x0000000000400000-0x0000000001B46000-memory.dmp
    Filesize

    23.3MB

    Download
  • memory/344-60-0x0000000075211000-0x0000000075213000-memory.dmp
    Filesize

    8KB

    Download
  • memory/740-67-0x0000000000000000-mapping.dmp
    Download
  • memory/900-65-0x0000000000000000-mapping.dmp
    Download
  • memory/924-63-0x0000000000000000-mapping.dmp
    Download
  • memory/1072-64-0x0000000000000000-mapping.dmp
    Download
  • memory/1352-70-0x0000000000000000-mapping.dmp
    Download
  • memory/1352-74-0x0000000000400000-0x0000000001B46000-memory.dmp
    Filesize

    23.3MB

    Download
  • memory/1524-66-0x0000000000000000-mapping.dmp
    Download
  • memory/1904-68-0x0000000000000000-mapping.dmp
    Download