Xls.Dropper.Agent-8211454-0 Office (OLE) / .XLS malware analysis — malicious · 4a96aae538d404ce

MALICIOUS

Office (OLE) / .XLS

147.0 KB Created: 2020-06-24 14:35:10 Authoring application: Microsoft Excel

MD5: 93e8e7e7e160b482c05db45c296405fb SHA-1: e71efdf545a51f766e3224d91f0f5460094a8d11 SHA-256: 4a96aae538d404ce44fbf23d7c3fb2df1cfc0d1d256dcd94b76fd94b97805d81

428 Risk Score

Malware Insights

Xls.Dropper.Agent-8211454-0 · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The sample is an Excel spreadsheet containing VBA macros. The document body prompts the user to 'enable content to show this transaction details', indicating a lure to enable macros. The presence of Workbook_Open and Auto_Open macros, along with critical heuristics for URLDownloadToFile in VBA and ShellExecute, strongly suggests that the macros are designed to download and execute a second-stage payload. The ClamAV detection name 'Xls.Dropper.Agent-8211454-0' further supports this classification.

Heuristics 11

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Xls.Dropper.Agent-8211454-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-8211454-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
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.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `cb4a48351dbee15e2905da4472288a9d076c3d2180222396e2845261ba3640c9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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