Office (OOXML) / .XLSM malware analysis — malicious · cbbd2deddb7d0383

MALICIOUS

Office (OOXML) / .XLSM

82.0 KB Created: 2021-01-13 21:50:57 UTC Authoring application: Microsoft Excel 16.0300

MD5: ee5986a4edb77ea262d19ef72d2464e7 SHA-1: b10deba685039451636c9b8eeec43cbea2d50c13 SHA-256: cbbd2deddb7d0383ab41b1ca5282d7a60b7137da61d3f3ec71ec7257038f3f05

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing VBA macros. The Workbook_Open macro is present and utilizes WScript.Shell and Shell() calls to execute arbitrary code. This indicates the document is designed to download and run a second-stage payload upon opening.

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` `d860679a094dd0d9b6b8219fb9b63cf4e9a47b8a6fed968ab83e098617ff42fa`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1977 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 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` `44be0caa6b898ad1b03984517dc47cda8741a8dab834c40af238bf4126859ced`	vba-project	OOXML VBA project: xl/vbaProject.bin	17408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 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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