Overview

overview

8

Static

static

1

SteamSetup.exe

windows10-ltsc 2021-x64

8

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General

  • Target

    SteamSetup.exe

  • Size

    2.3MB

  • Sample

    241023-vxkdzs1gnd

  • MD5

    1b54b70beef8eb240db31718e8f7eb5d

  • SHA1

    da5995070737ec655824c92622333c489eb6bce4

  • SHA256

    7d3654531c32d941b8cae81c4137fc542172bfa9635f169cb392f245a0a12bcb

  • SHA512

    fda935694d0652dab3f1017faaf95781a300b420739e0f9d46b53ce07d592a4cfa536524989e2fc9f83602d315259817638a89c4e27da709aada5d1360b717eb

  • SSDEEP

    49152:UDP/q9MIX/crfcNVBaXp1m0zyVCMwBHgFzoZhRP8:kC9MI8Hm0GCjgFc3Rk

Score
8/10
bootkitdefense_evasiondiscoveryexploitpersistenceransomware

Malware Config

Targets

    • Target

      SteamSetup.exe

    • Size

      2.3MB

    • MD5

      1b54b70beef8eb240db31718e8f7eb5d

    • SHA1

      da5995070737ec655824c92622333c489eb6bce4

    • SHA256

      7d3654531c32d941b8cae81c4137fc542172bfa9635f169cb392f245a0a12bcb

    • SHA512

      fda935694d0652dab3f1017faaf95781a300b420739e0f9d46b53ce07d592a4cfa536524989e2fc9f83602d315259817638a89c4e27da709aada5d1360b717eb

    • SSDEEP

      49152:UDP/q9MIX/crfcNVBaXp1m0zyVCMwBHgFzoZhRP8:kC9MI8Hm0GCjgFc3Rk

    Score
    8/10
    bootkitdefense_evasiondiscoveryexploitpersistenceransomware

    • Possible privilege escalation attempt

      exploit

    • Modifies file permissions

      discovery

    • Adds Run key to start application

      persistence

    • Downloads MZ/PE file

    • Legitimate hosting services abused for malware hosting/C2

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

      bootkitpersistence

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Sets desktop wallpaper using registry

      ransomware
    behavioral1

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

File and Directory Permissions Modification

1
T1222

Modify Registry

3
T1112

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Subvert Trust Controls

2
T1553

Install Root Certificate

1
T1553.004

SIP and Trust Provider Hijacking

1
T1553.003

Credential Access

Discovery

Browser Information Discovery

1
T1217

Query Registry

4
T1012

System Information Discovery

3
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1
T1102

Exfiltration

Impact

Defacement

1
T1491

Tasks