General

  • Target

    ovisetup.exe

  • Size

    3.7MB

  • Sample

    240608-xe7snsef3s

  • MD5

    706efb0990f7aa5332f8ef6f3b1c5993

  • SHA1

    ad57d0f430a79cbd1a1fcf27907bd15894103b13

  • SHA256

    bb5c467c398cbbb648668f5aaec8da190eab2de1fb2ee47d0e03b01483b4f53e

  • SHA512

    3a050d8854f8b8915ccbcb79a4883547b0e408c9ca327a0793cf21c7acddab4cde3f3619b741eb37b3dc98211ae0d7b65cea0f57a11b6bfc5d054c0fd3497233

  • SSDEEP

    98304:GVGtaEm35Jo2PTZpZq49ACYc18nxIusLz6cMlGWwH/gZGcg:SGtdz2PzA49AFcinbsLz84rfwGR

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/1140967450750484572/9nxWu2w_HfkHC1lMMNnzNPxLArNJ-MGc7djzUyKDcKdtmuzCF7HY_Gilg6rdXdzPw-v4

Targets

    • Target

      ovisetup.exe

    • Size

      3.7MB

    • MD5

      706efb0990f7aa5332f8ef6f3b1c5993

    • SHA1

      ad57d0f430a79cbd1a1fcf27907bd15894103b13

    • SHA256

      bb5c467c398cbbb648668f5aaec8da190eab2de1fb2ee47d0e03b01483b4f53e

    • SHA512

      3a050d8854f8b8915ccbcb79a4883547b0e408c9ca327a0793cf21c7acddab4cde3f3619b741eb37b3dc98211ae0d7b65cea0f57a11b6bfc5d054c0fd3497233

    • SSDEEP

      98304:GVGtaEm35Jo2PTZpZq49ACYc18nxIusLz6cMlGWwH/gZGcg:SGtdz2PzA49AFcinbsLz84rfwGR

    • 44Caliber

      An open source infostealer written in C#.

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Checks whether UAC is enabled

    • Looks up external IP address via web service

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

MITRE ATT&CK Matrix ATT&CK v13

Defense Evasion

Virtualization/Sandbox Evasion

1
T1497

Credential Access

Unsecured Credentials

2
T1552

Credentials In Files

2
T1552.001

Discovery

Query Registry

5
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

6
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

2
T1005

Tasks