stealc | 5e19860c1c39cd2f59baec1bf7e9ecef6894612bd90fd4a7418e051fab415ca9

Analysis

max time kernel
142s
max time network
123s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
29/01/2024, 14:09

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General

Target
file.exe
Size 2.0MB
Sample240129-rf5rtabeb8
SHA256 5e19860c1c39cd2f59baec1bf7e9ecef6894612bd90fd4a7418e051fab415ca9
MD5 e8c1d9e9dc777de306692212a00c1d64
SHA1 cd4479b8b3ab617c71b5f0c3cea45462578baac7
SHA512 2052fe1af88f3c22efc6e4b5bfd309dfcaeb50e5d9823ed330b9e1b8d65d5a4c8f4a5c7f28391faad3f251c162d70113cb5e39268e5cad9607cc5656e09fd6f6
SSDEEP 49152:ChQF2z0X1W34qvuyXPHcqaGqW9gwLgMyu5noEiyIJAuV:CeFdFWINS/NF9gpMR5oEfk
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

http://185.172.128.79

Attributes

url_path
/3886d2276f6914c4.php

rc4.plain

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
2988	BroomSetup.exe
2876	nsy946.tmp

Loads dropped DLL 8 IoCs

pid	Process
2784	file.exe
2784	file.exe
2784	file.exe
2784	file.exe
2784	file.exe
2876	nsy946.tmp
2876	nsy946.tmp
2784	file.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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	nsy946.tmp
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	nsy946.tmp

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2536	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
320	timeout.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2876	nsy946.tmp

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2988	BroomSetup.exe

Suspicious use of WriteProcessMemory 31 IoCs

description	pid	Process	procid_target
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2988	2784	file.exe	28
PID 2784 wrote to memory of 2876	2784	file.exe	29
PID 2784 wrote to memory of 2876	2784	file.exe	29
PID 2784 wrote to memory of 2876	2784	file.exe	29
PID 2784 wrote to memory of 2876	2784	file.exe	29
PID 2988 wrote to memory of 2452	2988	BroomSetup.exe	31
PID 2988 wrote to memory of 2452	2988	BroomSetup.exe	31
PID 2988 wrote to memory of 2452	2988	BroomSetup.exe	31
PID 2988 wrote to memory of 2452	2988	BroomSetup.exe	31
PID 2452 wrote to memory of 2512	2452	cmd.exe	33
PID 2452 wrote to memory of 2512	2452	cmd.exe	33
PID 2452 wrote to memory of 2512	2452	cmd.exe	33
PID 2452 wrote to memory of 2512	2452	cmd.exe	33
PID 2452 wrote to memory of 2536	2452	cmd.exe	34
PID 2452 wrote to memory of 2536	2452	cmd.exe	34
PID 2452 wrote to memory of 2536	2452	cmd.exe	34
PID 2452 wrote to memory of 2536	2452	cmd.exe	34
PID 2876 wrote to memory of 1956	2876	nsy946.tmp	35
PID 2876 wrote to memory of 1956	2876	nsy946.tmp	35
PID 2876 wrote to memory of 1956	2876	nsy946.tmp	35
PID 2876 wrote to memory of 1956	2876	nsy946.tmp	35
PID 1956 wrote to memory of 320	1956	cmd.exe	37
PID 1956 wrote to memory of 320	1956	cmd.exe	37
PID 1956 wrote to memory of 320	1956	cmd.exe	37
PID 1956 wrote to memory of 320	1956	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2784
- C:\Users\Admin\AppData\Local\Temp\BroomSetup.exe
  C:\Users\Admin\AppData\Local\Temp\BroomSetup.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2988
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2452
  - - C:\Windows\SysWOW64\chcp.com
      chcp 1251
      4⤵
      PID:2512
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /tn "MalayamaraUpdate" /tr "'C:\Users\Admin\AppData\Local\Temp\Updater.exe'" /sc minute /mo 30 /F
      4⤵
      Creates scheduled task(s)
      PID:2536
- C:\Users\Admin\AppData\Local\Temp\nsy946.tmp
  C:\Users\Admin\AppData\Local\Temp\nsy946.tmp
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2876
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\nsy946.tmp" & del "C:\ProgramData\*.dll"" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1956
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 5
      4⤵
      Delays execution with timeout.exe
      PID:320

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

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

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Downloads

BroomSetup.exe

Path C:\Users\Admin\AppData\Local\Temp\BroomSetup.exe
Size 4.7MB
SHA256 50a46b3120da828502ef0caba15defbad004a3adb88e6eacf1f9604572e2d503
MD5 5e94f0f6265f9e8b2f706f1d46bbd39e
SHA1 d0189cba430f5eea07efe1ab4f89adf5ae2453db
SHA512 473dfa66a36feed9b29a43245074141478327ce22ba7cce512599379dcb783b4d665e2d65c5e9750b988c7ed8f6c3349a7a12d4b8b57c89840eee6ca6e1a30cd
SSDEEP 49152:90oSiZ63YBmS9+rCgpvH8la0ZxRh+caGnj8HEQUhexTUT+1d/2/Tbt:0Ula0cGwXUheabt
MD5 SHA1 SHA512 SSDEEP

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nsy946.tmp

Path C:\Users\Admin\AppData\Local\Temp\nsy946.tmp
Size 335KB
SHA256 8952af1886c4433ffc0a3f31080ed526fccf87c99d248d6930af6c1c152dc442
MD5 4dfa88adbc1ef91990eae35f64612471
SHA1 d268117853b4e4fcf91497723cec4f79d75cab1f
SHA512 9b82badccc85983859fda625543c6e6ac751625b68bf6c103f007355fd92b2559b0a7348ca9af1b748adeea94109eb65a4c9addb312971c123427c714b3ceee7
SSDEEP 6144:k6ysLezYmROzs3pwGunMmj1QSWndb63N9LzUDKv/mXeGpYH3:jdLezYmRt3iGOZJWnd8N9uXe4
MD5 SHA1 SHA512 SSDEEP

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Task.bat

Path C:\Users\Admin\AppData\Roaming\Temp\Task.bat
Size 128B
SHA256 6be22058abfb22b40a42fb003f86b89e204a83024c03eb82cd53e2a0a047c331
MD5 11bb3db51f701d4e42d3287f71a6a43e
SHA1 63a4ee82223be6a62d04bdfe40ef8ba91ae49a86
SHA512 907ad2c070cc1db89f43459a94d7f48985d939d749c9648b78572a266f0d3fde47813a129e9151dbf4a7d96d36f588172f57c88b8b947b56ed818d7d068abab2
MD5 SHA1 SHA512

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mozglue.dll

Path \ProgramData\mozglue.dll
Size 593KB
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
SSDEEP 12288:BlSyAom/gcRKMdRm4wFkRHuyG4RRGJVDjMk/x21R8gY/r:BKgcRKMdRm4wFkVVDGJVv//x21R8br
MD5 SHA1 SHA512 SSDEEP

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nss3.dll

Path \ProgramData\nss3.dll
Size 2.0MB
SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
MD5 1cc453cdf74f31e4d913ff9c10acdde2
SHA1 6e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA512 dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571
SSDEEP 49152:fECf12gikHlnKGxJRIB+y5nvxnaOSJ3HFNWYrVvE4CQsgzMmQfTU1NrWmy4KoAzh:J7Tf8J1Q+SS5/nr
MD5 SHA1 SHA512 SSDEEP

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INetC.dll

Path \Users\Admin\AppData\Local\Temp\nso649.tmp\INetC.dll
Size 25KB
SHA256 85e03805f90f72257dd41bfdaa186237218bbb0ec410ad3b6576a88ea11dccb9
MD5 40d7eca32b2f4d29db98715dd45bfac5
SHA1 124df3f617f562e46095776454e1c0c7bb791cc7
SHA512 5fd4f516ce23fb7e705e150d5c1c93fc7133694ba495fb73101674a528883a013a34ab258083aa7ce6072973b067a605158316a4c9159c1b4d765761f91c513d
SSDEEP 384:pjj9e9dE95XD+iTx58Y5oMM3O9MEoLr1VcQZ/ZwcSyekMRlZ4L4:dAvE90GuY2tO93oLrJRM7Z4E
MD5 SHA1 SHA512 SSDEEP

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memory/2876-37-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/2876-28-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/2876-27-0x0000000000220000-0x000000000023C000-memory.dmp

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memory/2876-26-0x0000000000700000-0x0000000000800000-memory.dmp

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memory/2876-97-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/2876-103-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/2876-104-0x0000000000700000-0x0000000000800000-memory.dmp

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memory/2988-10-0x0000000000240000-0x0000000000241000-memory.dmp

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memory/2988-92-0x0000000000400000-0x00000000008E2000-memory.dmp

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memory/2988-113-0x0000000000240000-0x0000000000241000-memory.dmp

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