stealc | 33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9

General

Target

33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe
Size

1.7MB
MD5

a96a1e3cd98f61d168cde4fa2524ba86
SHA1

d3390200fa1010c9e668e3aa04e716b1d79bda79
SHA256

33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9
SHA512

f7b280a7f7b0f3dc220919ff53a8e6ee2807f4ed1dabe0aa06843d0bc4f0f4a54c848d9117b39b1c7f8800ad6ee454b79d046a3188ceb02bd112fb97ce7e4a06
SSDEEP

49152:lT4NrRZIzAF6ld8hpXIXwpeqpm0xq2guKeoM/d:NUrAkF6lGnX+AHxqPej

Score

10^/10

stealc brat defense_evasion discovery stealer

Malware Config

Extracted

Family

stealc

Botnet

brat

C2

http://185.215.113.206

Attributes

url_path
/c4becf79229cb002.php

Signatures

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

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS 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\SystemBiosVersion	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Wine	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

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 NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2240	2428	WerFault.exe	27

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe
2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2428 wrote to memory of 2240	2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe	31
PID 2428 wrote to memory of 2240	2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe	31
PID 2428 wrote to memory of 2240	2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe	31
PID 2428 wrote to memory of 2240	2428	33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe	31

C:\Users\Admin\AppData\Local\Temp\33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe
"C:\Users\Admin\AppData\Local\Temp\33f3ae2fdeffa8bd003888fcde73083b14c879ccb2d4bb860da3f5d2cd0e5dd9.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2428
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2428 -s 936
  2⤵
  - Program crash
  PID:2240

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

5

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2428-0-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-1-0x0000000077C20000-0x0000000077C22000-memory.dmp

Filesize
8KB

Download
memory/2428-2-0x00000000009C1000-0x00000000009D8000-memory.dmp

Filesize
92KB

Download
memory/2428-3-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-4-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-5-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-6-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-7-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-8-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-9-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-10-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download
memory/2428-12-0x00000000009C0000-0x000000000103A000-memory.dmp

Filesize
6.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads