Office (OOXML) / .XLSM malware analysis — malicious · 45b7ef5a55cbcddb

MALICIOUS

Office (OOXML) / .XLSM

87.2 KB Created: 2006-09-28 05:33:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: 21f5a279cdb8389e79a711ae43a9215a SHA-1: 74516a2bedf8b8aa4551cedba8a62e68209c0068 SHA-256: 45b7ef5a55cbcddb1f21415450ee982ebdafac1cf3a57e62acb8d014bc797dfc

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to run an external command. Although the script is truncated, the presence of a Shell() call strongly suggests it's designed to download and execute a second-stage payload. The macro's obfuscated string concatenation, like 'pcw' & 'w', and the use of `Application.StatusBar` for progress indication are common evasion tactics.

Heuristics 4

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8a7e7819df6b91f47eafc2ab79d0af373d8adb5e25bdbaf0c3846296f5a42d91`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6227 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` `7b271daa54c3562323e00e2c0201c1de025b6fcc41316fba479191aee0f70050`	vba-project	OOXML VBA project: xl/vbaProject.bin	27648 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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