Office (OOXML) / .XLSM malware analysis — malicious · 1ec8b22f4a970d74

MALICIOUS

Office (OOXML) / .XLSM

390.6 KB Created: 2020-10-14 16:28:11 UTC Authoring application: Microsoft Excel 16.0300

MD5: 9bfb900a48ba7f7ccf67998a4f7eae81 SHA-1: 8a243c08aadb04f1e93615d7ce5dce36b3dc1ea4 SHA-256: 1ec8b22f4a970d74ba70a9271499a038c9edaa54ce022b38107e0e21dbddddf0

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment

This XLSM file contains a Workbook_Open macro, a common technique for executing malicious VBA code upon opening. The presence of a NOP sled and a CreateObject call further suggests the execution of arbitrary code. While no specific URLs were extracted, the macro's likely intent is to download and execute a second-stage payload, characteristic of a downloader malware.

Heuristics 6

NOP sled detected high SC_NOP_SLED

Found 20+ consecutive 0x90 bytes
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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.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` `3316ca22f56f276f6caebe57314fb616d52f0c815906aaf90aa7e2b959ddbf17`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5995 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` `8ad501ca0a8765d9ba27937c189f375eeeb76a4828101b846bcd9e0bd0d47885`	vba-project	OOXML VBA project: xl/vbaProject.bin	27648 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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