Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 69230008ebd4db70…

MALICIOUS

Office (OLE) / .XLS

107.0 KB Created: 2022-09-26 04:46:32 Authoring application: Microsoft Excel First seen: 2022-09-26
MD5: 4b7e91a5f07bfa63ebfbdc143210cc9e SHA-1: 169d96a1b25a369dd0ae99ac6f03c817cb9ff929 SHA-256: 69230008ebd4db702b501b5d35d6c5551ae5d1cc779d0bbcf4526f606f332650
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218 System Binary Proxy Execution T1105 Ingress Tool Transfer

The file contains VBA macros, including an Auto_Open subroutine, which is a common technique for executing malicious code upon opening an Office document. Heuristics indicate the use of LOLBins and obfuscated API calls like 'WScript.Shell', suggesting the script attempts to download and execute a second-stage payload. The reconstructed URL 'http://exe.999O_P/642.491.3.291//:ptth' is highly suspicious and likely points to the download location of the payload.

Heuristics 8

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • 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.
  • Reference to certutil (download/decode) high SC_STR_CERTUTIL
    Reference to certutil (download/decode)
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9341472611735e41842168a3deb7f85c41f091e3096f8399c9850b1e3478870d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8341 bytes

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