General

  • Target

    QUOTATION.doc

  • Size

    264KB

  • Sample

    210120-jm9tg6yn96

  • MD5

    0e038d032902a690430c70eb33883cb0

  • SHA1

    27d41bdda3d1c9c2f59d33e9a8a384bfc7e2971b

  • SHA256

    678c5e3b494d58314a8eac0c391c6ef9a13bbd983d40603a717b902be954cd2c

  • SHA512

    42520cb600a909d39f28929ec97cd844508b91e41bd51d18a12c42bfa661cce2a24ce82c4010c0f6cbaf3d55db1a426bde70789830bf3800f69c4ee3ca01e036

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.privateemail.com
  • Port:
    587
  • Username:
    sales1@razorwirefecning.com
  • Password:
    Blessings@12345

Targets

    • Target

      QUOTATION.doc

    • Size

      264KB

    • MD5

      0e038d032902a690430c70eb33883cb0

    • SHA1

      27d41bdda3d1c9c2f59d33e9a8a384bfc7e2971b

    • SHA256

      678c5e3b494d58314a8eac0c391c6ef9a13bbd983d40603a717b902be954cd2c

    • SHA512

      42520cb600a909d39f28929ec97cd844508b91e41bd51d18a12c42bfa661cce2a24ce82c4010c0f6cbaf3d55db1a426bde70789830bf3800f69c4ee3ca01e036

    • AgentTesla

      Agent Tesla is a remote access tool (RAT) written in visual basic.

    • Modifies WinLogon for persistence

    • Modifies Windows Defender Real-time Protection settings

    • Windows security bypass

    • AgentTesla Payload

    • Looks for VirtualBox Guest Additions in registry

    • Blocklisted process makes network request

    • Executes dropped EXE

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

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

    • Drops startup file

    • Loads dropped DLL

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

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

    • Windows security modification

    • Adds Run key to start application

    • Legitimate hosting services abused for malware hosting/C2

    • Maps connected drives based on registry

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

    • Drops file in System32 directory

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Execution

Exploitation for Client Execution

1
T1203

Persistence

Winlogon Helper DLL

1
T1004

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

6
T1112

Disabling Security Tools

3
T1089

Virtualization/Sandbox Evasion

2
T1497

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

6
T1012

Virtualization/Sandbox Evasion

2
T1497

System Information Discovery

5
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

3
T1005

Command and Control

Web Service

1
T1102

Tasks