Sload — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 25bfe4322807c675…

MALICIOUS

Office (OOXML) / .DOC

51.9 KB Created: 2014-07-10 11:13:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: d78b8fe9cfde3d8d9c353f14f82caf0d SHA-1: 36d83c15f1872298d8dc3d329c4d7a40103ab79f SHA-256: 25bfe4322807c6753e1b3e0b2d5ff06d17cc69512ac62ca505be1441751d9c6f
522 Risk Score

Malware Insights

Sload · confidence 100%

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 User Execution: Malicious File T1105 Ingress Tool Transfer T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1204.002 User Execution: Malicious File

The sample contains a Document_Open macro that explicitly calls URLDownloadToFile to fetch an executable from a Dropbox URL and subsequently executes it using WScript.Shell. This behavior is consistent with the ClamAV detection of Sload and the high-priority heuristic firings for VBA downloaders.

Heuristics 12

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • ClamAV: Doc.Downloader.Sload-6961205-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sload-6961205-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 https://www.dropbox.com/s/f2a5njbhdzdns5v/gejjy.exe?dl=1
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b4940658373604af8baf5498d45ac6f11c987e546feea538a46edb8d31de2dec		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1205 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
eff0b2d25f96c28845a67a48addd29985cf7cb59132ee909c5875312623c536e		 vba-project OOXML VBA project: word/vbaProject.bin 13312 bytes
Detection
ClamAV: Doc.Downloader.Sload-6961205-0
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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