Office (OOXML) / .XLSM malware analysis — malicious · a5be5f9347de2f4a

MALICIOUS

Office (OOXML) / .XLSM

82.0 KB Created: 2021-01-28 21:36:17 UTC Authoring application: Microsoft Excel 15.0300

MD5: 527434ab39e0b9af6b912a5950230fab SHA-1: 0185f098d3a401932d66bba5bb476e865caaece9 SHA-256: a5be5f9347de2f4a77271bea70dc1822c1ec54e11b475ffe4fa545774208f6c9

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The XLSM file contains a Workbook_Open macro that utilizes WScript.Shell and the Shell() function to execute arbitrary commands. This indicates the document is designed to download and run a second-stage payload upon opening. The presence of multiple critical and high severity heuristics related to VBA macro execution confirms this malicious intent.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `fcc51ecf5a7c1ff8be12701cc04d78f27c98ff2089722db40d79b2ebb1874e2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2135 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `2b085fbd7aac1912c290d5c02e55b63fc9519a09474b61d985ff0658f73c4b7a`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). 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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