Dridex Office (OOXML) / .XLSM malware analysis — malicious · a6f017baf22da14d

MALICIOUS

Office (OOXML) / .XLSM

414.3 KB Created: 2021-02-16 12:27:12 UTC Authoring application: Microsoft Excel 12.0000

MD5: 1e5aff0bb593872b0e948b4ed13a6a49 SHA-1: 6b6b6d570d29de8326fcf16e1560d50ffeeb2172 SHA-256: a6f017baf22da14d583b1029326eb1d87ac4cd2f93eabcee21ff8db90881c9f7

280 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The file is an XLSM document containing VBA macros. A critical heuristic indicates the presence of a Workbook_Open macro that uses Shell() with character-shift decoding to execute a command. ClamAV identifies the file as Xls.Downloader.DridexGreen09213-9890103-0, strongly suggesting a Dridex downloader variant. The macro likely downloads and executes a second-stage payload.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `4ef304b0563325dbe4d4b39b0fee89896ca3daeebc02b77b9d142bbefdac21ef`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	21292 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` `95a0f9d1cb72ab58895484d3864989f3789a04ddb8a8daed619e5946a4e570b0`	vba-project	OOXML VBA project: xl/vbaProject.bin	32768 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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