Office (OOXML) / .XLSM malware analysis — malicious · d1c616976e917d54

MALICIOUS

Office (OOXML) / .XLSM

27.3 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-25

MD5: 7e16f1c9d7216db83080d42fb8b01a10 SHA-1: 12164c37b4d31a728f8af96e3e8ca4314068d20b SHA-256: d1c616976e917d54778f587a2550ee5568a72b661d5f04e68d194ce998864d84

382 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The Workbook_Open macro executes a command using cmd.exe to download a file from the URL http://18.179.111.240/xr0/loader/uploads/scan08710203065.exe using certutil.exe, and then executes the downloaded file. This indicates a downloader or droppper functionality. The ClamAV detection also confirms the malicious nature of the file.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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://18.179.111.240/xr0/loader/uploads/scan08710203065.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `54832fdc27ee508fc59eb811e05d3ebe3ec504d32a96d8084a439dd5147571c6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1107 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `f04d067b2eb19bea3e1862d3763738355554cbd1bdee32a878101232cc70d890`	vba-project	OOXML VBA project: xl/vbaProject.bin	5632 bytes
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: unlikely

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