stealc | a5bcc672d91ff60374275df4680a61fac1ade6562d16851dd3e3acd2d2efab98

General

Target

$TEMP/syncUpd.exe
Size

199KB
MD5

c30ba6943a94d2e8ed78cd2ca1bc207d
SHA1

9f72b0a089b6c66a1e81b25fe0b652f3bbb85b79
SHA256

d14472c3ab77a8e09ce45dbf6dfc686657539fc9520b510b4417f99114cfd7e8
SHA512

8080ae1b569b6f0f65814758ee3cdbf45f51e1411c731850751980b9310eb3493f64b6b85e681059f9354ea07fb110f1865f5b613c6dc90290f6fcb3b5b194a0
SSDEEP

3072:CHO6XigQe+JK1vljkjdv/oJIOSe7NC1RhrW2O4:C5Xp+WSjd38v7NC3

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

C2

http://185.172.128.145

Attributes

url_path
/3cd2b41cbde8fc9c.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc

Detect binaries embedding considerable number of MFA browser extension IDs. 5 IoCs

resource	yara_rule
behavioral8/memory/2204-43-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral8/memory/2204-50-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral8/memory/2204-51-0x0000000000680000-0x0000000000780000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral8/memory/2204-62-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs
behavioral8/memory/2204-86-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_MFA_Browser_Extension_IDs

Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs. 5 IoCs

resource	yara_rule
behavioral8/memory/2204-43-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral8/memory/2204-50-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral8/memory/2204-51-0x0000000000680000-0x0000000000780000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral8/memory/2204-62-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs
behavioral8/memory/2204-86-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_Embedded_Crypto_Wallet_Browser_Extension_IDs

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

resource	yara_rule
behavioral8/memory/2204-43-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral8/memory/2204-50-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral8/memory/2204-62-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral8/memory/2204-86-0x0000000000400000-0x000000000063B000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Downloads MZ/PE file

Loads dropped DLL 2 IoCs

pid	Process
2204	syncUpd.exe
2204	syncUpd.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 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	syncUpd.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	syncUpd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2204	syncUpd.exe
2204	syncUpd.exe

C:\Users\Admin\AppData\Local\Temp\$TEMP\syncUpd.exe
"C:\Users\Admin\AppData\Local\Temp\$TEMP\syncUpd.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
PID:2204

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

3

T1552

Credentials In Files

3

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
C:\ProgramData\nss3.dll

Filesize
2.0MB

MD5
1cc453cdf74f31e4d913ff9c10acdde2

SHA1
6e85eae544d6e965f15fa5c39700fa7202f3aafe

SHA256
ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

SHA512
dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

Download Submit
memory/2204-1-0x0000000000680000-0x0000000000780000-memory.dmp

Filesize
1024KB

Download
memory/2204-2-0x00000000009C0000-0x00000000009E7000-memory.dmp

Filesize
156KB

Download
memory/2204-3-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2204-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/2204-43-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2204-50-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2204-51-0x0000000000680000-0x0000000000780000-memory.dmp

Filesize
1024KB

Download
memory/2204-52-0x00000000009C0000-0x00000000009E7000-memory.dmp

Filesize
156KB

Download
memory/2204-62-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download
memory/2204-86-0x0000000000400000-0x000000000063B000-memory.dmp

Filesize
2.2MB

Download

Analysis

Sharing