stealc | c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89

Analysis

max time kernel
136s
max time network
134s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
05/06/2024, 02:10

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General

Target

c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe
Size

3.6MB
MD5

131e367009cf014321e7a70e70c4067c
SHA1

4c02332af53519fdae235f804f5144ba9c7e725d
SHA256

c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89
SHA512

3702fefbcf4eab279484359f61d997b7c32d9c77dd9e255a44e96de9373d18b68ff262037494203f181c359aca549020dcfea3db01d11f8f51e224261259f99e
SSDEEP

49152:fWN3Bsjz4Ddee7wE4o40nQaoJab9Xejv2aH0n2EBvnE8/8OhkqdHG22T9d:f6ujz4DdeClnE8f4T

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 2 IoCs

stealer

resource	yara_rule
behavioral2/memory/5068-67-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/5068-69-0x0000000000400000-0x0000000000648000-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

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

resource	yara_rule
behavioral2/memory/5068-67-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/5068-69-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 2 IoCs

resource	yara_rule
behavioral2/memory/5068-67-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL
behavioral2/memory/5068-69-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL

Detects executables containing potential Windows Defender anti-emulation checks 2 IoCs

resource	yara_rule
behavioral2/memory/5068-67-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation
behavioral2/memory/5068-69-0x0000000000400000-0x0000000000648000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_WindDefender_AntiEmaulation

Downloads MZ/PE file

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	RegAsm.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2384 set thread context of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94

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 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	RegAsm.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3984	timeout.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe
2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe
5068	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 1800	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	93
PID 2384 wrote to memory of 1800	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	93
PID 2384 wrote to memory of 1800	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	93
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 2384 wrote to memory of 5068	2384	c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe	94
PID 5068 wrote to memory of 4620	5068	RegAsm.exe	109
PID 5068 wrote to memory of 4620	5068	RegAsm.exe	109
PID 5068 wrote to memory of 4620	5068	RegAsm.exe	109
PID 4620 wrote to memory of 3984	4620	cmd.exe	111
PID 4620 wrote to memory of 3984	4620	cmd.exe	111
PID 4620 wrote to memory of 3984	4620	cmd.exe	111

C:\Users\Admin\AppData\Local\Temp\c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe
"C:\Users\Admin\AppData\Local\Temp\c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2384
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:1800
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:5068
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" & rd /s /q "C:\ProgramData\CBKFBAECBAEG" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4620
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:3984

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4176,i,5711962389779687290,1245653010537220991,262144 --variations-seed-version --mojo-platform-channel-handle=4080 /prefetch:8
1⤵
PID:2416

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-appcompat-clear --field-trial-handle=3540,i,5711962389779687290,1245653010537220991,262144 --variations-seed-version --mojo-platform-channel-handle=1300 /prefetch:3
1⤵
PID:4164

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\Microsoft\Edge\User Data\Default\Network\SCT Auditing Pending Reports

Filesize
2B

MD5
d751713988987e9331980363e24189ce

SHA1
97d170e1550eee4afc0af065b78cda302a97674c

SHA256
4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945

SHA512
b25b294cb4deb69ea00a4c3cf3113904801b6015e5956bd019a8570b1fe1d6040e944ef3cdee16d0a46503ca6e659a25f21cf9ceddc13f352a3c98138c15d6af

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network\Sdch Dictionaries

Filesize
40B

MD5
20d4b8fa017a12a108c87f540836e250

SHA1
1ac617fac131262b6d3ce1f52f5907e31d5f6f00

SHA256
6028bd681dbf11a0a58dde8a0cd884115c04caa59d080ba51bde1b086ce0079d

SHA512
507b2b8a8a168ff8f2bdafa5d9d341c44501a5f17d9f63f3d43bd586bc9e8ae33221887869fa86f845b7d067cb7d2a7009efd71dda36e03a40a74fee04b86856

Download Submit
memory/2384-24-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-34-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-30-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-5-0x0000000005A20000-0x0000000005AEC000-memory.dmp

Filesize
816KB

Download
memory/2384-6-0x0000000005700000-0x000000000571C000-memory.dmp

Filesize
112KB

Download
memory/2384-50-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-56-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-66-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-1-0x0000000000B80000-0x0000000000F16000-memory.dmp

Filesize
3.6MB

Download
memory/2384-2-0x0000000005840000-0x00000000058DC000-memory.dmp

Filesize
624KB

Download
memory/2384-62-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-64-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-60-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-58-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-54-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-52-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-46-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-44-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-42-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-40-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-3-0x0000000075210000-0x00000000759C0000-memory.dmp

Filesize
7.7MB

Download
memory/2384-36-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-4-0x0000000005930000-0x0000000005A1E000-memory.dmp

Filesize
952KB

Download
memory/2384-28-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-26-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-23-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-20-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-14-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-48-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-38-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-32-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-0-0x000000007521E000-0x000000007521F000-memory.dmp

Filesize
4KB

Download
memory/2384-18-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-16-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-12-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-10-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-9-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-7-0x0000000005700000-0x0000000005715000-memory.dmp

Filesize
84KB

Download
memory/2384-73-0x0000000075210000-0x00000000759C0000-memory.dmp

Filesize
7.7MB

Download
memory/2384-74-0x0000000075210000-0x00000000759C0000-memory.dmp

Filesize
7.7MB

Download
memory/5068-69-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/5068-67-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download