MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4f43f9b5de8e532a4c7f31df433fd2c5d9d66e269247a1181c8345d36bb058ad. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry



RemcosRAT


Vendor detections: 12


Maldoc score: 7


Intelligence 12 IOCs YARA 1 File information Comments

SHA256 hash: 4f43f9b5de8e532a4c7f31df433fd2c5d9d66e269247a1181c8345d36bb058ad
SHA3-384 hash: 1c1610041dd00ad8a696a6e863c3b4db99439e1e611611526517160b32eb9b5a5dd8a365b5e64d1ab0b1cd18edb84537
SHA1 hash: 915935872f62bf1a931be87525dd89d909e648f5
MD5 hash: 332fd3985922abed9187950c475f4483
humanhash: jersey-queen-comet-coffee
File name:BoFA_Remittance Advice.BoFA00002251.xlsb
Download: download sample
Signature RemcosRAT
File size:159'210 bytes
First seen:2022-01-05 19:26:05 UTC
Last seen:2022-01-05 21:09:47 UTC
File type:Excel file xlsx
MIME type:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
ssdeep 3072:vvepgMBsvVWL/npS9rV2Fj2Gy9xot4wEX:Cg2EVa89rW2GynC4wY
TLSH T1A3F36A3EC4A6DCA1C18ED63DD53EA7D8B7358924C2815BD562F80C0C7E772FD9A8A490
Reporter James_inthe_box
Tags:RemcosRAT xlsb xlsx

Office OLE Information


This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 7
OLE dump

MalwareBazaar was able to identify 11 sections in this file using oledump:

Section IDSection sizeSection name
A1414 bytesPROJECT
A262 bytesPROJECTwm
A3991 bytesVBA/Sheet1
A43771 bytesVBA/ThisWorkbook
A52646 bytesVBA/_VBA_PROJECT
A61699 bytesVBA/__SRP_0
A7248 bytesVBA/__SRP_1
A8996 bytesVBA/__SRP_2
A9378 bytesVBA/__SRP_3
A10522 bytesVBA/dir
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecWorkbook_OpenRuns when the Excel Workbook is opened
SuspiciousCreateObjectMay create an OLE object
SuspiciousCallByNameMay attempt to obfuscate malicious function calls
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence


File Origin
# of uploads :
2
# of downloads :
169
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
ACH Credits Notification - Payment Date -1522 (213 KB).msg
Verdict:
Malicious activity
Analysis date:
2022-01-05 17:36:00 UTC
Tags:
rat remcos stealer trojan

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
True
Result
Verdict:
Malware
Maliciousness:

Behaviour
DNS request
Creating a window
Сreating synchronization primitives
Searching for the window
Creating a process with a hidden window
Launching a process
Sending an HTTP GET request
Sending a custom TCP request
Creating a file in the %temp% directory
Creating a process from a recently created file
Running batch commands
Launching a process by exploiting the app vulnerability
Sending an HTTP GET request to an infection source
Result
Verdict:
Malicious
File Type:
Excel File with Macro
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
macros macros-on-open powershell virus wacatac wscript
Result
Verdict:
MALICIOUS
Details
Chunked Suspicious Strings
Detected seemingly chunked sensitive strings. High likely hood of obfuscated malintent.
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Result
Threat name:
Unknown
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Signature
Document contains an embedded VBA macro with suspicious strings
Document exploit detected (process start blacklist hit)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Suspicious PowerShell Cmdline
Sigma detected: Suspicious Script Execution From Temp Folder
Sigma detected: WScript or CScript Dropper
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
Uses ping.exe to check the status of other devices and networks
Very long command line found
Writes or reads registry keys via WMI
Writes registry values via WMI
Wscript starts Powershell (via cmd or directly)
Behaviour
Behavior Graph:
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 548465 Sample: BoFA_Remittance Advice.BoFA... Startdate: 05/01/2022 Architecture: WINDOWS Score: 100 33 google.com 2->33 47 Multi AV Scanner detection for domain / URL 2->47 49 Multi AV Scanner detection for submitted file 2->49 51 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->51 53 7 other signatures 2->53 9 EXCEL.EXE 53 14 2->9         started        signatures3 process4 file5 29 ~$BoFA_Remittance ...e.BoFA00002251.xlsb, data 9->29 dropped 63 Suspicious powershell command line found 9->63 13 powershell.exe 16 7 9->13         started        signatures6 process7 dnsIp8 41 zybnla.sn.files.1drv.com 13->41 43 sn-files.fe.1drv.com 13->43 45 onedrive.live.com 13->45 31 C:\Users\user\AppData\Local\Temp\twt.vbs, ASCII 13->31 dropped 65 Uses ping.exe to check the status of other devices and networks 13->65 18 wscript.exe 11 13->18         started        22 PING.EXE 13->22         started        file9 signatures10 process11 dnsIp12 35 64.188.19.241, 49168, 80 ASN-QUADRANET-GLOBALUS United States 18->35 55 System process connects to network (likely due to code injection or exploit) 18->55 57 Wscript starts Powershell (via cmd or directly) 18->57 59 Very long command line found 18->59 61 2 other signatures 18->61 24 powershell.exe 7 18->24         started        27 cmd.exe 18->27         started        37 google.com 142.250.185.110 GOOGLEUS United States 22->37 signatures13 process14 dnsIp15 39 104.223.119.167, 49169, 80 ASN-QUADRANET-GLOBALUS United States 24->39
Threat name:
Script-Macro.Downloader.EncDoc
Status:
Malicious
First seen:
2022-01-05 19:26:07 UTC
File Type:
Document
Extracted files:
28
AV detection:
18 of 28 (64.29%)
Threat level:
  3/5
Result
Malware family:
Score:
  10/10
Tags:
family:remcos botnet:shiesty macro rat
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Runs ping.exe
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Suspicious use of SetThreadContext
Loads dropped DLL
Blocklisted process makes network request
Process spawned unexpected child process
Remcos
Malware Config
C2 Extraction:
shiestynerd.dvrlists.com:10174
Please note that we are no longer able to provide a coverage score for Virus Total.

YARA Signatures


MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:BitcoinAddress
Author:Didier Stevens (@DidierStevens)
Description:Contains a valid Bitcoin address

File information


The table below shows additional information about this malware sample such as delivery method and external references.

  
Delivery method
Other

Comments