stealc | d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67

Analysis

max time kernel
78s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
06-06-2024 06:41

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General

Target

d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe
Size

1.8MB
MD5

8df7549f7fd2f933c2cdf8b8bbda162b
SHA1

b3b2c29447b00ed84b14a7aad604632543232208
SHA256

d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67
SHA512

2060b259c95264f205cd30bf4af94b77f7966df144e1f600f65df5afffd807816ba02f8c35663703e70309ed3279461b6ce216b42fe76142b7639e421f8fccec
SSDEEP

49152:k75B7FDFXb9Ya8aesY3Ot4N7G/IeUAtK:k75RFD/n0etD/INAt

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

https://t.me/r8z0l

https://steamcommunity.com/profiles/76561199698764354

Attributes

user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Signatures

Detect Vidar Stealer 8 IoCs

stealer

resource	yara_rule
behavioral2/memory/504-2-0x00000000029B0000-0x0000000002AFB000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar

Detect binaries embedding considerable number of MFA browser extension IDs. 4 IoCs

resource	yara_rule
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs

Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs. 4 IoCs

resource	yara_rule
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs

Detects Windows executables referencing non-Windows User-Agents 7 IoCs

resource	yara_rule
behavioral2/memory/4260-4-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4260-9-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4260-10-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 4 IoCs

resource	yara_rule
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 7 IoCs

resource	yara_rule
behavioral2/memory/4260-4-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/4260-9-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/4260-10-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL

Detects executables containing potential Windows Defender anti-emulation checks 7 IoCs

resource	yara_rule
behavioral2/memory/4260-4-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/4260-9-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/4260-10-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
4260	kat8174.tmp

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 504 set thread context of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92

Checks processor information in registry 2 TTPs 1 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat8174.tmp

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4260	kat8174.tmp
4260	kat8174.tmp

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92
PID 504 wrote to memory of 4260	504	d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe	92

C:\Users\Admin\AppData\Local\Temp\d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe
"C:\Users\Admin\AppData\Local\Temp\d38a9f6ac940fd239ba8bfc7f979d1abf5e7a0b0e2420d077d5daa2a40919a67.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:504
- C:\Users\Admin\AppData\Local\Temp\kat8174.tmp
  C:\Users\Admin\AppData\Local\Temp\kat8174.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:4260

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat8174.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/504-0-0x00000000006C0000-0x00000000006C1000-memory.dmp

Filesize
4KB

Download
memory/504-2-0x00000000029B0000-0x0000000002AFB000-memory.dmp

Filesize
1.3MB

Download
memory/504-6-0x0000000000400000-0x00000000005CD000-memory.dmp

Filesize
1.8MB

Download
memory/4260-4-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4260-9-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4260-10-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4260-22-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4260-23-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4260-25-0x000000001DC10000-0x000000001DE6F000-memory.dmp

Filesize
2.4MB

Download
memory/4260-40-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/4260-41-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download