MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546. 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


GuLoader


Vendor detections: 13


Intelligence 13 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546
SHA3-384 hash: db221bbd48b894f4e52b61aa2eefff38414008a8cdc4671f8870337e774bd6dbf2744d6aa06186dc8e8c7cde2938a2d6
SHA1 hash: a475519e2cade20a5d5614ab5fc66c637a1f7996
MD5 hash: c0644a075912eda8c219f81fc25d80a2
humanhash: blossom-papa-salami-crazy
File name:Letter-Receipt.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:819'496 bytes
First seen:2024-03-22 09:34:56 UTC
Last seen:2024-03-22 11:41:12 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash b34f154ec913d2d2c435cbd644e91687 (533 x GuLoader, 110 x RemcosRAT, 80 x EpsilonStealer)
ssdeep 12288:ghUQmD3ceDqZWJPgCls1bINQhysTF82jb+OSX4S4AGrsEqleoGoOX:ghUD3cZWJ4DbcQrTFDa+rsLko
TLSH T19A058C13B9D82414FC2CA37E546B8E3A06737F72897A642F75A8742345B37437A6312E
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10523/12/4)
9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
6.8% (.EXE) Win32 Executable (generic) (4504/4/1)
File icon (PE):PE icon
dhash icon c4cce0d0d080a2e0 (2 x GuLoader)
Reporter TeamDreier
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Antares
Issuer:Antares
Algorithm:sha256WithRSAEncryption
Valid from:2023-07-10T08:35:47Z
Valid to:2026-07-09T08:35:47Z
Serial number: 03a90f8e30723e2c6974997f11e4b2d57fab0939
Thumbprint Algorithm:SHA256
Thumbprint: 4a81d19e5c90a7ceda8981318df3fa2cf5a3420ef221d30200141bdb840453e9
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
2
# of downloads :
337
Origin country :
DK DK
Vendor Threat Intelligence
Malware family:
agenttesla
Create hunting rule
ID:
1
File name:
Letter-Receipt.exe
Verdict:
Malicious activity
Analysis date:
2024-03-21 13:47:24 UTC
Tags:
agenttesla stealer
Link:
https://app.any.run/tasks/eedf0b20-6363-489d-93d9-184be28e0927

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Creating a window
Creating a file in the %temp% subdirectories
Launching a process
Creating a file
Changing a file
Running batch commands
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
installer lolbin overlay packed shell32
Link:
https://www.filescan.io/uploads/65fd50ce87137159d44e85f8/reports/7d2e826f-a544-4aeb-afb9-2b4dee711ae3/overview
Verdict:
Malicious
Labled as:
Tedy.Generic
Link:
https://www.hybrid-analysis.com/sample/b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/f9d0dacf-d75d-4358-a49a-70ee207081c3
Result
Threat name:
AgentTesla, GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1413964
Signature
Antivirus detection for URL or domain
Found malware configuration
Initial sample is a PE file and has a suspicious name
Installs a global keyboard hook
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Obfuscated command line found
Powershell drops PE file
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sigma detected: Suspicious Script Execution From Temp Folder
Snort IDS alert for network traffic
Suspicious powershell command line found
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses the Telegram API (likely for C&C communication)
Writes to foreign memory regions
Yara detected AgentTesla
Yara detected GuLoader
Yara detected Telegram RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1413964 Sample: Letter-Receipt.exe Startdate: 22/03/2024 Architecture: WINDOWS Score: 100 34 api.telegram.org 2->34 36 www.kreodev.fr 2->36 38 2 other IPs or domains 2->38 48 Snort IDS alert for network traffic 2->48 50 Found malware configuration 2->50 52 Antivirus detection for URL or domain 2->52 56 8 other signatures 2->56 8 Letter-Receipt.exe 21 2->8         started        signatures3 54 Uses the Telegram API (likely for C&C communication) 34->54 process4 file5 24 C:\Users\user\...\Vrdiforskydninger182.Ten, ASCII 8->24 dropped 58 Suspicious powershell command line found 8->58 12 powershell.exe 20 8->12         started        signatures6 process7 file8 26 C:\Users\user\AppData\...\Letter-Receipt.exe, PE32 12->26 dropped 60 Obfuscated command line found 12->60 62 Writes to foreign memory regions 12->62 64 Powershell drops PE file 12->64 16 wab.exe 15 8 12->16         started        20 conhost.exe 12->20         started        22 cmd.exe 1 12->22         started        signatures9 process10 dnsIp11 28 api.telegram.org 149.154.167.220, 443, 49714, 49715 TELEGRAMRU United Kingdom 16->28 30 kreodev.fr 46.105.60.70, 443, 49712 OVHFR France 16->30 32 api.ipify.org 104.26.13.205, 443, 49713 CLOUDFLARENETUS United States 16->32 40 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 16->40 42 Tries to steal Mail credentials (via file / registry access) 16->42 44 Tries to harvest and steal browser information (history, passwords, etc) 16->44 46 Installs a global keyboard hook 16->46 signatures12
Score:
98%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546/
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Suspicious
First seen:
2024-03-21 14:29:02 UTC
File Type:
PE (Exe)
Extracted files:
6
AV detection:
15 of 24 (62.50%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xgcoj2mkledpfzfkn3wok5jh2baqxp37vjoqdqz7ykakn6d5gvda._file
Verdict:
malicious
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla family:guloader downloader keylogger persistence spyware stealer trojan
Link:
https://tria.ge/reports/240322-lkbrmscg8t/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in Program Files directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Looks up external IP address via web service
AgentTesla
Guloader,Cloudeye
Malware Config
C2 Extraction:
https://api.telegram.org/bot7095947285:AAH0OAWsNNNRaRk-0tgESWW6mHr4jwUMS9o/
Unpacked files
SH256 hash:
b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546
MD5 hash:
c0644a075912eda8c219f81fc25d80a2
SHA1 hash:
a475519e2cade20a5d5614ab5fc66c637a1f7996
Link:
https://www.unpac.me/results/43a67a44-7885-443f-9c72-4deebe6ac60d/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b984e4e98a59/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
GuLoader
Score:
0.90
Link:
https://yomi.yoroi.company/submissions/b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546

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:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:PE_Potentially_Signed_Digital_Certificate
Create hunting rule
Author:albertzsigovits

File information

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

Malspam

GuLoader

Executable exe b984e4e98a5906f2e4aa6eece57527d0410bbf7faa5d01c33fc280a6f87d3546

(this sample)

  
Delivery method
Distributed via e-mail attachment

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high
Reviews
IDCapabilitiesEvidence
COM_BASE_APICan Download & Execute componentsole32.dll::CoCreateInstance
SECURITY_BASE_APIUses Security Base APIADVAPI32.dll::AdjustTokenPrivileges
ADVAPI32.dll::SetFileSecurityW
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteExW
SHELL32.dll::SHFileOperationW
SHELL32.dll::SHGetFileInfoW
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CreateProcessW
ADVAPI32.dll::OpenProcessToken
KERNEL32.dll::CloseHandle
KERNEL32.dll::CreateThread
WIN_BASE_APIUses Win Base APIKERNEL32.dll::LoadLibraryExW
KERNEL32.dll::GetDiskFreeSpaceW
KERNEL32.dll::GetCommandLineW
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CopyFileW
KERNEL32.dll::CreateDirectoryW
KERNEL32.dll::CreateFileW
KERNEL32.dll::DeleteFileW
KERNEL32.dll::MoveFileExW
KERNEL32.dll::MoveFileW
WIN_BASE_USER_APIRetrieves Account InformationADVAPI32.dll::LookupPrivilegeValueW
WIN_REG_APICan Manipulate Windows RegistryADVAPI32.dll::RegCreateKeyExW
ADVAPI32.dll::RegDeleteKeyW
ADVAPI32.dll::RegOpenKeyExW
ADVAPI32.dll::RegQueryValueExW
ADVAPI32.dll::RegSetValueExW
WIN_USER_APIPerforms GUI ActionsUSER32.dll::AppendMenuW
USER32.dll::EmptyClipboard
USER32.dll::FindWindowExW
USER32.dll::OpenClipboard
USER32.dll::PeekMessageW
USER32.dll::CreateWindowExW

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