Overview

overview

10

Static

static

3

lsess.exe

windows7-x64

10

lsess.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    lsess.bin

  • Size

    55KB

  • Sample

    240203-kxzhssgabj

  • MD5

    fd0ef924c1edc067cd2298024a7057b0

  • SHA1

    0a32d7600869f37f0fbe2a5c996cda5111d4a4d1

  • SHA256

    cd89fd5bf3049fad64718c190ae014b4c9c0d141e3550d63008c1c5c71d50bd7

  • SHA512

    275efb2d22ceaed29c4c4563782f648663ea752a6b08d4472ba12d29dc76c57b2120c3a5984d08f5a0ebdd3abf68e6ea8af1325ff9eb24830c43c8c489ad44c0

  • SSDEEP

    1536:HNeRBl5PT/rx1mzwRMSTdLpJ47kmvBMRM:HQRrmzwR5JWk2+

Score
10/10
phobosevasionpersistenceransomwarespywarestealer

Malware Config

Targets

    • Target

      lsess.bin

    • Size

      55KB

    • MD5

      fd0ef924c1edc067cd2298024a7057b0

    • SHA1

      0a32d7600869f37f0fbe2a5c996cda5111d4a4d1

    • SHA256

      cd89fd5bf3049fad64718c190ae014b4c9c0d141e3550d63008c1c5c71d50bd7

    • SHA512

      275efb2d22ceaed29c4c4563782f648663ea752a6b08d4472ba12d29dc76c57b2120c3a5984d08f5a0ebdd3abf68e6ea8af1325ff9eb24830c43c8c489ad44c0

    • SSDEEP

      1536:HNeRBl5PT/rx1mzwRMSTdLpJ47kmvBMRM:HQRrmzwR5JWk2+

    Score
    10/10
    phobosevasionpersistenceransomwarespywarestealer

    • Phobos

      Phobos ransomware appeared at the beginning of 2019.

      ransomwarephobos

    • Deletes shadow copies

      Ransomware often targets backup files to inhibit system recovery.

      ransomware

    • Modifies boot configuration data using bcdedit

      ransomwareevasion

    • Renames multiple (310) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

      ransomware

    • Deletes backup catalog

      Uses wbadmin.exe to inhibit system recovery.

      ransomware

    • Modifies Windows Firewall

      evasion

    • Checks computer location settings

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

    • Drops startup file

    • Reads user/profile data of web browsers

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

      spywarestealer

    • Adds Run key to start application

      persistence

    • Drops desktop.ini file(s)

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

Persistence

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Indicator Removal

3
T1070

File Deletion

3
T1070.004

Impair Defenses

1
T1562

Disable or Modify System Firewall

1
T1562.004

Modify Registry

2
T1112

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Query Registry

3
T1012

System Information Discovery

3
T1082

Peripheral Device Discovery

1
T1120

Lateral Movement

Collection

Data from Local System

1
T1005

Exfiltration

Command and Control

Impact

Inhibit System Recovery

4
T1490

Resource Development

Reconnaissance

Tasks