MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 40ef770b7e795ac45da6703d0ed205addf13a692ed3d3b2c2bb4acbaf71c3a19. 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: 8


Intelligence 12 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 40ef770b7e795ac45da6703d0ed205addf13a692ed3d3b2c2bb4acbaf71c3a19
SHA3-384 hash: 9deb721a3ccad540b79ad1984898dd0fbf627a890aff55221e0c9e670f9d90d0d569cc406b8dc029341305412f2acd93
SHA1 hash: e68ec776c041c7d58d69663ffe114f1da218f2b2
MD5 hash: dae044d98ed0f60f46ea1eb433101b14
humanhash: florida-seven-enemy-failed
File name:WFPAY48227865.xls
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:33'792 bytes
First seen:2022-04-14 05:38:09 UTC
Last seen:2022-04-17 15:17:00 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 768:srgk3hOdsylKlgxopeiBNhZFGzE+cL2kdAJcyD43SsV04fumZ7Cr:sEk3hOdsylKlgxopeiBNhZFGzE+cL2kI
TLSH T164E23DA2B786D90AC99907764CE7C2E63727FC519F93834B3289F71E1F71A808903657
Reporter abuse_ch
Tags:RAT RemcosRAT xls


Avatar
abuse_ch
RemcosRAT payload URLs:
http://gotovacoil.com/setting/Encrypted Client OG.jpg
http://gotovacoil.com/setting/Protected Client.vbs
http://gotovacoil.com/setting/attack.txt

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: 8
OLE dump

MalwareBazaar was able to identify 15 sections in this file using oledump:

Section IDSection sizeSection name
1108 bytesCompObj
2244 bytesDocumentSummaryInformation
3220 bytesSummaryInformation
417200 bytesWorkbook
5463 bytes_VBA_PROJECT_CUR/PROJECT
680 bytes_VBA_PROJECT_CUR/PROJECTwm
71692 bytes_VBA_PROJECT_CUR/VBA/GLBQC
8991 bytes_VBA_PROJECT_CUR/VBA/Sheet1
91615 bytes_VBA_PROJECT_CUR/VBA/ThisWorkbook
102743 bytes_VBA_PROJECT_CUR/VBA/_VBA_PROJECT
111584 bytes_VBA_PROJECT_CUR/VBA/__SRP_0
12151 bytes_VBA_PROJECT_CUR/VBA/__SRP_1
13214 bytes_VBA_PROJECT_CUR/VBA/__SRP_2
14220 bytes_VBA_PROJECT_CUR/VBA/__SRP_3
15562 bytes_VBA_PROJECT_CUR/VBA/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
SuspiciousGetObjectMay get an OLE object with a running instance
SuspiciousChrMay attempt to obfuscate specific strings (use option --deobf to deobfuscate)
SuspiciousExecMay run an executable file or a system
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 :
326
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
WFPAY48227865.xls
Verdict:
Malicious activity
Analysis date:
2022-04-14 05:38:57 UTC
Tags:
macros maldoc-20
Link:
https://app.any.run/tasks/99c3bd08-c90d-42e7-af18-de3228f33b14

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/263549/
Detection(s):
TwinWave.GetObjectStringManipulationDontMessAroundWithJim.20200804.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.VB.Trojan.Valyria.6303.6943.22173.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RemcosBite.M2.20220408.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.OdysseyAndBattle.20210707.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.TakeMeHomeTonight.20210923.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.OutRunThis.20220121.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Launching a process
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File with Macro
Link:
https://app.docguard.net/40ef770b7e795ac45da6703d0ed205addf13a692ed3d3b2c2bb4acbaf71c3a19/results/dashboard
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
macros
Link:
https://www.filescan.io/uploads/6257b377482f2f41caabecb4/reports/40bc3ec3-7035-40db-b06b-eede3741e3c3/overview
Label:
Malicious
Suspicious Score:
5.9/10
Score Malicious:
59%
Score Benign:
41%
Link:
https://www.malware.ai/gui/files/?id=bdb75f68-9a16-4a7c-9f08-11a35bb4914e
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/976573
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Delayed program exit found
DLL side loading technique detected
Document contains an embedded VBA macro which may execute processes
Document exploit detected (process start blacklist hit)
Drops VBS files to the startup folder
Found malware configuration
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Powershell drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Notepad Making Network Connection
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)
Very long command line found
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected Costura Assembly Loader
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 609063 Sample: WFPAY48227865.xls Startdate: 14/04/2022 Architecture: WINDOWS Score: 100 45 google.com 2->45 53 Multi AV Scanner detection for domain / URL 2->53 55 Found malware configuration 2->55 57 Malicious sample detected (through community Yara rule) 2->57 59 13 other signatures 2->59 10 EXCEL.EXE 53 13 2->10         started        14 iexplore.exe 1 33 2->14         started        16 wscript.exe 2->16         started        signatures3 process4 file5 41 C:\Users\user\Desktop\WFPAY48227865.xls, Composite 10->41 dropped 75 Suspicious powershell command line found 10->75 18 powershell.exe 12 7 10->18         started        23 iexplore.exe 14 14->23         started        signatures6 process7 dnsIp8 47 gotovacoil.com 72.48.234.249, 49171, 49172, 49173 GRANDECOM-AS1US United States 18->47 39 C:\Users\user\AppData\Local\...\notepad.vbs, ASCII 18->39 dropped 61 Powershell drops PE file 18->61 25 wscript.exe 1 18->25         started        file9 signatures10 process11 signatures12 71 Wscript starts Powershell (via cmd or directly) 25->71 73 Very long command line found 25->73 28 powershell.exe 9 25->28         started        33 powershell.exe 7 25->33         started        process13 dnsIp14 51 gotovacoil.com 28->51 43 C:\Users\user\AppData\...\AgileDotNetRT64.dll, PE32+ 28->43 dropped 77 Writes to foreign memory regions 28->77 79 DLL side loading technique detected 28->79 81 Injects a PE file into a foreign processes 28->81 35 notepad.exe 2 28->35         started        83 Drops VBS files to the startup folder 33->83 file15 signatures16 process17 dnsIp18 49 freshdirect.dvrlists.com 185.19.85.174, 119, 49175 DATAWIRE-ASCH Switzerland 35->49 63 System process connects to network (likely due to code injection or exploit) 35->63 65 Contains functionality to steal Chrome passwords or cookies 35->65 67 Contains functionality to steal Firefox passwords or cookies 35->67 69 Delayed program exit found 35->69 signatures19
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/40ef770b7e795ac45da6703d0ed205addf13a692ed3d3b2c2bb4acbaf71c3a19/
Threat name:
Script.Trojan.Woreflint
Create hunting rule
Status:
Malicious
First seen:
2022-04-13 16:29:07 UTC
File Type:
Document
Extracted files:
19
AV detection:
15 of 41 (36.59%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=idxxoc36pfnmixngoa6q5uqfvxprhjus5u6twlblwswlv5y4himq._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost rat
Link:
https://tria.ge/reports/220414-gcagdsgfc4/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
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
Checks computer location settings
Loads dropped DLL
Blocklisted process makes network request
Process spawned unexpected child process
Remcos
Malware Config
C2 Extraction:
freshdirect.dvrlists.com:119
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.80
Link:
https://yomi.yoroi.company/submissions/40ef770b7e795ac45da6703d0ed205addf13a692ed3d3b2c2bb4acbaf71c3a19

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
Create hunting rule
Author:Didier Stevens (@DidierStevens)
Description:Contains a valid Bitcoin address
Rule name:malware_shellcode_hash
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect shellcode api hash value

File information

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

Malspam

RemcosRAT

Excel file xls 40ef770b7e795ac45da6703d0ed205addf13a692ed3d3b2c2bb4acbaf71c3a19

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/host/gotovacoil.com/
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/263549/

Comments