MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 a35739159d8ec8a88d901e6f299abdf7050719a14e19bca9dd2cc1bc43fefbf8. 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: 13
Maldoc score: 9
| SHA256 hash: | a35739159d8ec8a88d901e6f299abdf7050719a14e19bca9dd2cc1bc43fefbf8 |
|---|---|
| SHA3-384 hash: | dd299ec5e72b6517c745027b84b92dc4388903b7a2c485d19833c6eb4d94524bcb2185a799657a5598cc32a44984aa5f |
| SHA1 hash: | 07cda98e0352fe5a8e50bfcae691888f986b8c47 |
| MD5 hash: | aa904f344c89b2ebf901a0a131641ba4 |
| humanhash: | papa-muppet-wisconsin-delta |
| File name: | New purchase order CYO-751.xlsb |
| Download: | download sample |
| Signature | RemcosRAT |
| File size: | 58'206 bytes |
| First seen: | 2022-05-27 15:27:32 UTC |
| Last seen: | 2022-05-30 07:04:26 UTC |
| File type: |  xlsx |
| MIME type: | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| ssdeep | 1536:SOElqxNdUVuPuOvcN9etgALXs7GAe2hGw:SOElqpUVzycC5jiGAbT |
| TLSH | T16843F28AD548E828F79F4BB259C8B8D27217629C2542195F2C05931E7E196F3370A1FF |
| TrID | 50.4% (.XLSM) Excel Microsoft Office Open XML Format document (with Macro) (57500/1/12) 29.8% (.XLSX) Excel Microsoft Office Open XML Format document (34000/1/7) 15.3% (.ZIP) Open Packaging Conventions container (17500/1/4) 3.5% (.ZIP) ZIP compressed archive (4000/1) 0.8% (.PG/BIN) PrintFox/Pagefox bitmap (640x800) (1000/1) |
| Reporter |  abuse_ch |
| 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: 9 |
OLE dump
MalwareBazaar was able to identify 13 sections in this file using oledump:
| Section ID | Section size | Section name |
|---|---|---|
| A1 | 422 bytes | PROJECT |
| A2 | 62 bytes | PROJECTwm |
| A3 | 1180 bytes | VBA/Sheet1 |
| A4 | 5399 bytes | VBA/ThisWorkbook |
| A5 | 2911 bytes | VBA/_VBA_PROJECT |
| A6 | 2513 bytes | VBA/__SRP_0 |
| A7 | 305 bytes | VBA/__SRP_1 |
| A8 | 2583 bytes | VBA/__SRP_2 |
| A9 | 368 bytes | VBA/__SRP_3 |
| A10 | 464 bytes | VBA/__SRP_4 |
| A11 | 106 bytes | VBA/__SRP_5 |
| A12 | 522 bytes | 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:
| Type | Keyword | Description |
|---|---|---|
| AutoExec | Workbook_Activate | Runs when the Excel Workbook is opened |
| IOC | RqEfk.vbs | Executable file name |
| Suspicious | Environ | May read system environment variables |
| Suspicious | Open | May open a file |
| Suspicious | CreateObject | May create an OLE object |
| Suspicious | Hex Strings | Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
Intelligence
File Origin
# of uploads :
2
# of downloads :
348
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
New purchase order CYO-751.xlsb
Verdict:
Malicious activity
Analysis date:
2022-05-26 08:24:30 UTC
Tags:
macros macros-on-open
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Result
Verdict:
Malware
Maliciousness:
Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Creating a file in the %AppData% directory
Launching a process
Creating a process with a hidden window
DNS request
Sending a custom TCP request
Running batch commands
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
Excel File with Macro
Document image
Image:
Verdict:
Likely Malicious
Threat level:
7.5/10
Confidence:
100%
Tags:
macros macros-on-open
Label:
Malicious
Suspicious Score:
9.9/10
Score Malicious:
1%
Score Benign:
0%
Result
Verdict:
MALICIOUS
Link:
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Result
Threat name:
Remcos
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Connects to many ports of the same IP (likely port scanning)
Contains functionality to inject code into remote processes
Contains functionality to register a low level keyboard hook
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 with suspicious strings
Document exploit detected (creates forbidden files)
Document exploit detected (process start blacklist hit)
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Malicious sample detected (through community Yara rule)
Microsoft Office drops suspicious files
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Potential malicious VBS script found (suspicious strings)
Powershell drops PE file
Sigma detected: Office product drops script at suspicious location
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
Uses dynamic DNS services
Very long command line found
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Threat name:
Document-Office.Dropper.SDrop
Status:
Malicious
First seen:
2022-05-25 19:36:05 UTC
File Type:
Document
Extracted files:
29
AV detection:
7 of 41 (17.07%)
Threat level:
3/5
Detection(s):
Suspicious file
Result
Malware family:
remcos
Score:
10/10
Tags:
family:remcos botnet:june rat
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 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:
menz.ddns.net:45901
Malware family:
Remcos
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Malspam
Delivery method
Distributed via e-mail attachment
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