Office (OOXML) / .XLSM malware analysis — malicious · 7b8a3db8ad89f6f0

MALICIOUS

Office (OOXML) / .XLSM

431.1 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-12

MD5: ae4b46ae7dff6534843f0007f045dbd6 SHA-1: ac23f123045396b875746f8c6f110da06d9dcf2d SHA-256: 7b8a3db8ad89f6f0ef0415fbbd6befce941821f8afa58adecaa0d4f78676a689

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://100.26.109.199/r-7/loader/uploads/87452103309785412000img.exe using certutil.exe, saving it as Lwkwgheo.exe.exe, and then executing it. This indicates the document is a dropper for a secondary payload. The ClamAV detection further supports its malicious nature.

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://100.26.109.199/r-7/loader/uploads/87452103309785412000img.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `686ac590a314fab2364557e2667433f867a8f1ce814ff541560dd2a0ab8224ac`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1119 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` `ab47b3275b8200064a73fd5e95a59d8d357966a59b677317c54636d239de8293`	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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