Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 1b7fa30ee9e2d65c…

MALICIOUS

Office (OOXML) / .DOC

75.9 KB Created: 2021-03-23 04:06:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: bdc20f143589d9119a3cf1d50a74af97 SHA-1: 1d0e4eecafb3fe0b4ba047b5162fc86e1e3e4601 SHA-256: 1b7fa30ee9e2d65c435e4ea1eb5d2fdd60a936007b14b66f007cf3aaf7af7c6f
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros, specifically an AutoOpen macro, which is designed to execute automatically upon opening. The macros utilize Shell() and CreateObject() calls, indicative of an attempt to download and execute a second-stage payload. The presence of WScript.Shell usage further supports this, suggesting the script is designed to interact with the operating system to achieve its malicious objective.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3c2119a8bc6191fac1d347759d8d25779c033ae1b1bc6c1113388b3aba2e3da3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4817 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
f8f42090b723bae2f7eb9b1a7cc1a95e8da21182d34435605a32772b76861688		 vba-project OOXML VBA project: word/vbaProject.bin 28160 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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