Office (OOXML) / .XLSM malware analysis — malicious · a9995f610ad9790e

MALICIOUS

Office (OOXML) / .XLSM

398.2 KB

MD5: be02b373b312f95d42f8eff9801fdf99 SHA-1: 2b9098b1a3ba1d4ac9f68388b02af14631464380 SHA-256: a9995f610ad9790ea4059fbf7c98f23c793f23010d579e32a306a0af6c5d4793

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro that executes a PowerShell command. This command downloads an executable from 'http://www.poltc.cz/zackova/lmao.exe' and saves it as 'C:\Users\Public\Documents\jjqee.exe', then executes it. This behavior is indicative of a dropper malware.

Heuristics 8

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
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND

Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
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://www.poltc.cz/zackova/lmao.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `73acd744680457b9abd27d1aad88fa4937ff22ed231696b9e94e00fb2fe4721d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1630 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` `65d88e56c97c67531b8b2a1afa3bbb5fd0141af6a626fdd2428f5ce174bcc33a`	vba-project	OOXML VBA project: xl/vbaProject.bin	5120 bytes
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: unlikely

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