Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 7bb94464b3d84793…

MALICIOUS

Office (OLE) / .DOCX

156.7 KB Created: 2021-01-04 18:59:00 Authoring application: Microsoft Office Word
MD5: eca7b443bdd18089d1e72b2394abfd96 SHA-1: 23c7fb3fc159ef732d4a7bf4e0309ef3242c4138 SHA-256: 7bb94464b3d84793306c5871494ec5b557815c2dee93f5ff5ba01e1fe7c85d88
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer T1047 WMI

The sample contains VBA macros that are automatically executed upon opening the document. These macros utilize obfuscation techniques, such as splitting string literals to reassemble 'Scripting.FileSystemObject', and proceed to create and write to files on the filesystem. This behavior strongly suggests the intent to download and execute a secondary payload, a common tactic for Emotet.

Heuristics 7

  • 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.
  • ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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
  • 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.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
28e0aab9def1820176582f12126397a14f2c858209766b704c735ce1d1db4cc2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7154 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.