Office (OOXML) / .XLSM malware analysis — malicious · 39bac5add12a82ca

MALICIOUS

Office (OOXML) / .XLSM

102.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300

MD5: 5b335944f6b6844462cc337fb6b300ec SHA-1: a03cb06cd940e6cb5c06efb5e414996394d8a385 SHA-256: 39bac5add12a82ca3d87c562fb6d31257a395110550007b5a1f3aac8a55f4101

382 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing a Workbook_Open macro that executes a command using cmd.exe. This command utilizes certutil.exe to download a batch script from the URL http://18.159.59.253/cut/396180999746067.bat and saves it as Mgembggxmxalduz.exe.exe, which is then executed. This indicates a downloader pattern designed to fetch and run a second-stage payload.

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://18.159.59.253/cut/396180999746067.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `eea2263c69f4a81fa0369d2ebb9fbe950203bdb6a022bf80992d3aa6e3972543`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1109 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` `4eda00ab33eb1e7b71dfbe0ead628c76a19396e616b3e7a6a846f2f098036f5e`	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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