Office (OOXML) / .XLSM malware analysis — malicious · cac4c04dbfdb8587

MALICIOUS

Office (OOXML) / .XLSM

23.1 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: 036c8ffb1b1a48a347c1e13566cb23a0 SHA-1: 302ccf035f1c8f448e12de576cec44a2b537adc6 SHA-256: cac4c04dbfdb8587fb70b6fd10fd028e41ca43a6b637a049046b6a8b7a0af4c3

162 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLSM file contains a Workbook_Open macro that executes a Shell() command. The macro code is heavily obfuscated, but it appears to be designed to download and execute a second-stage payload. The presence of the Workbook_Open macro and the Shell() call are strong indicators of malicious intent. The extracted artifacts 'macros.bas' and 'vbaProject_00.bin' are also indicative of macro-based malware.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `1d7f1d33080f9aeb42b96e81c5bd999a91b0afded5b0aad1ee6a7840f1a17479`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7757 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely 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` `c97b5b74281d4a9c9310a64d059e357d1671360a084035c4f8554e940446962f`	vba-project	OOXML VBA project: xl/vbaProject.bin	35840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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