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

Static analysis result for SHA-256 b705a0eadebd68be…

MALICIOUS

Office (OOXML) / .DOC

55.3 KB Created: 2020-05-28 10:25:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: 0e885a6fbaa0e39e31d820282a2d6f15 SHA-1: 9e98ae5674a612cfad85c41ef222b0da9031ce08 SHA-256: b705a0eadebd68bef140ecbc721d0650c4b2eb31d655e611a91e08251b25bd80
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The sample contains a VBA macro that executes a Base64-decoded shell command. This command uses PowerShell to download a second-stage executable from 'http://stfu.stike.xyz:2095/lek/2.exe', save it to the temporary directory as 'gNRWQ.exe', and then execute it. The presence of the Document_Open macro and WScript.Shell usage indicates a typical dropper behavior.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER
    VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.
  • ClamAV: Doc.Dropper.Generic-9823774-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Generic-9823774-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.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/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
4ed6fdef859da49f1722df6564640eecf2bd59fb1fccd3af0259659700e6a1dc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2634 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
c4bf92306b003a0ca5cbe9b7f8c73ae9c5370c4e8ec0a38a4496c751510bf70e		 vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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