Malicious Office (OLE) / .PPT — malware analysis report

Static analysis result for SHA-256 151807491899be33…

MALICIOUS

Office (OLE) / .PPT

68.5 KB Created: 2021-04-13 10:01:41 Authoring application: Microsoft Office PowerPoint
MD5: d138effb5d830510eaf493eaba3ba912 SHA-1: 91acc37cac952cf17f7e78959a334c84af05a60a SHA-256: 151807491899be3374cd280331f4d7200f8a951c99b9c9c6d0641b919638f4a0
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1219 Remote Access Software T1566.001 Spearphishing Attachment

The sample contains VBA macros, including an Auto_Close macro that is triggered automatically. This macro uses GetObject to instantiate a COM object and then calls its EXEC method with a dynamically constructed string. The script reassembles the COM object identifier as 'new:F935DC22-1CF0-11D0-ADB9-00C04FD58A0B' and the execution command as 'http://tyuisab.hskagshj.wqtyibx.ghjqgsjh/mp/HHTTappj.'. This indicates the macro is designed to download and execute a second-stage payload from the constructed URL.

Heuristics 5

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
72cc19770ed4db831c33f475066d9305803cf68b6e7bc4941757dd2d93e8f6f7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1737 bytes

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