stealc | 0effe718a91a56be8af1a21d673a6c670adeae79054fa3eb9d7394f791c6a105

Analysis

max time kernel
140s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
20/02/2024, 03:47

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General

Target
27634d8ac8758c32b829c18aed415075.exe
Size 2.0MB
Sample240220-eb7pdsae2x
SHA256 0effe718a91a56be8af1a21d673a6c670adeae79054fa3eb9d7394f791c6a105
MD5 27634d8ac8758c32b829c18aed415075
SHA1 a89f6213c2fd69aa57d6091f8ed550b1e1a7bae9
SHA512 115563e55def90fcf60f6b02f2588259ebd7d3e840a5c133479c92817ece242be724746159122d832d3a303c0e3e5f80e0e5d5da44b6fd61ce7b73dec64e477e
SSDEEP 49152:ChUF2z0X1W34qvuyXPHcqaGqW9gwLgMyu5noEiyIJAub:CaFdFWINS/NF9gpMR5oEfS
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

http://185.172.128.79

Attributes

url_path
/3cd2b41cbde8fc9c.php

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
932	BroomSetup.exe
4164	nsk5304.tmp

Loads dropped DLL 5 IoCs

pid	Process
4276	27634d8ac8758c32b829c18aed415075.exe
4276	27634d8ac8758c32b829c18aed415075.exe
4164	nsk5304.tmp
4164	nsk5304.tmp
4276	27634d8ac8758c32b829c18aed415075.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

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4404	4164	WerFault.exe	85

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	nsk5304.tmp
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	nsk5304.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
1784	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4164	nsk5304.tmp
4164	nsk5304.tmp
4164	nsk5304.tmp
4164	nsk5304.tmp

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
932	BroomSetup.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4276 wrote to memory of 932	4276	27634d8ac8758c32b829c18aed415075.exe	84
PID 4276 wrote to memory of 932	4276	27634d8ac8758c32b829c18aed415075.exe	84
PID 4276 wrote to memory of 932	4276	27634d8ac8758c32b829c18aed415075.exe	84
PID 4276 wrote to memory of 4164	4276	27634d8ac8758c32b829c18aed415075.exe	85
PID 4276 wrote to memory of 4164	4276	27634d8ac8758c32b829c18aed415075.exe	85
PID 4276 wrote to memory of 4164	4276	27634d8ac8758c32b829c18aed415075.exe	85
PID 932 wrote to memory of 1756	932	BroomSetup.exe	86
PID 932 wrote to memory of 1756	932	BroomSetup.exe	86
PID 932 wrote to memory of 1756	932	BroomSetup.exe	86
PID 1756 wrote to memory of 4924	1756	cmd.exe	88
PID 1756 wrote to memory of 4924	1756	cmd.exe	88
PID 1756 wrote to memory of 4924	1756	cmd.exe	88
PID 1756 wrote to memory of 1784	1756	cmd.exe	89
PID 1756 wrote to memory of 1784	1756	cmd.exe	89
PID 1756 wrote to memory of 1784	1756	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\27634d8ac8758c32b829c18aed415075.exe
"C:\Users\Admin\AppData\Local\Temp\27634d8ac8758c32b829c18aed415075.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:4276
- 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:932
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1756
  - - C:\Windows\SysWOW64\chcp.com
      chcp 1251
      4⤵
      PID:4924
  - - 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:1784
- C:\Users\Admin\AppData\Local\Temp\nsk5304.tmp
  C:\Users\Admin\AppData\Local\Temp\nsk5304.tmp
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:4164
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4164 -s 2000
    3⤵
    - Program crash
    PID:4404

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4164 -ip 4164
1⤵
PID:4832

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

Replay Monitor

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Downloads

Are.docx

Path C:\ProgramData\Are.docx
Size 11KB
SHA256 5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454
MD5 a33e5b189842c5867f46566bdbf7a095
SHA1 e1c06359f6a76da90d19e8fd95e79c832edb3196
SHA512 f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b
SSDEEP 192:CtNCEE33S7Ok0CMSYbcBVk6tqM16iPBkeawLWdxd7o3Lp:aNwC78uYbcBv6akwLWdxdE3Lp
MD5 SHA1 SHA512 SSDEEP

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mozglue.dll

Path C:\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 C:\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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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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INetC.dll

Path C:\Users\Admin\AppData\Local\Temp\nsd4EEC.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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nsk5304.tmp

Path C:\Users\Admin\AppData\Local\Temp\nsk5304.tmp
Size 228KB
SHA256 6eca8b24dd0d2804116757151bcc85f3ef3eebb0e4d4da4f974192e78cd0c773
MD5 e43227e4cad3830b355f94b5c612c619
SHA1 8b7e1bcd5f3d6c53eb813437ae54b81a4352aab9
SHA512 ffe143d93624fb4745035cf4acff088847c42f22e091cbdd6a5be4295e685fe0f87d518780bf8de2ceaad484b345df55125f1fa56b486a9c109fc8d16ec7030c
SSDEEP 3072:Lz21S3rE91+MmJfI6N6i3qT1P0JGfwOcWX4d1sK99UJMT9iK0M5IJeu:hK+MmRNgi6TBwG47Zr7ZxmE
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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memory/932-7-0x0000000000B00000-0x0000000000B01000-memory.dmp

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memory/932-117-0x0000000000B00000-0x0000000000B01000-memory.dmp

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memory/932-72-0x0000000000400000-0x00000000008E2000-memory.dmp

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memory/4164-18-0x0000000000810000-0x0000000000910000-memory.dmp

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memory/4164-76-0x0000000000400000-0x0000000000647000-memory.dmp

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memory/4164-24-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/4164-20-0x0000000000400000-0x0000000000647000-memory.dmp

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memory/4164-110-0x0000000000400000-0x0000000000647000-memory.dmp

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memory/4164-19-0x00000000007B0000-0x00000000007E4000-memory.dmp

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