stealc | 2515eaa2524af3e606406d5e0b7d20565d6c1a2a06903a4ff0d0fceaba7414b8

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
21/02/2024, 01:16

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General

Target
0141234b91988ec9abae7f93fa083835.exe
Size 299KB
Sample240221-bmsstsha3v
SHA256 2515eaa2524af3e606406d5e0b7d20565d6c1a2a06903a4ff0d0fceaba7414b8
MD5 0141234b91988ec9abae7f93fa083835
SHA1 233bb6dccd5398637420312eebdc79c77ec2c6be
SHA512 d81765d14dedfbc341f1b02d6688a13753d6724e4861bccead9bf3a7a2dd427001d3df492962aa639740130f8d11463074fa2edb3b602764e10571aba015ba53
SSDEEP 6144:WSWXZbqf5jOI9ldcNqqDrlXI5uLbzA1XD36XKI:WLXZbqhjOI9lqNRDreuAQt
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

http://185.172.128.145

Attributes

url_path
/3cd2b41cbde8fc9c.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
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-1-5-21-983843758-932321429-1636175382-1000\Control Panel\International\Geo\Nation	0141234b91988ec9abae7f93fa083835.exe

Executes dropped EXE 2 IoCs

pid	Process
4656	u3rw.0.exe
4424	u3rw.1.exe

Loads dropped DLL 2 IoCs

pid	Process
4656	u3rw.0.exe
4656	u3rw.0.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 2 IoCs

pid	pid_target	Process	procid_target
2568	4892	WerFault.exe	82
964	4656	WerFault.exe	83

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	u3rw.0.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	u3rw.0.exe

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
3980	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4656	u3rw.0.exe
4656	u3rw.0.exe
4656	u3rw.0.exe
4656	u3rw.0.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4424	u3rw.1.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4892 wrote to memory of 4656	4892	0141234b91988ec9abae7f93fa083835.exe	83
PID 4892 wrote to memory of 4656	4892	0141234b91988ec9abae7f93fa083835.exe	83
PID 4892 wrote to memory of 4656	4892	0141234b91988ec9abae7f93fa083835.exe	83
PID 4892 wrote to memory of 4424	4892	0141234b91988ec9abae7f93fa083835.exe	87
PID 4892 wrote to memory of 4424	4892	0141234b91988ec9abae7f93fa083835.exe	87
PID 4892 wrote to memory of 4424	4892	0141234b91988ec9abae7f93fa083835.exe	87
PID 4424 wrote to memory of 4880	4424	u3rw.1.exe	93
PID 4424 wrote to memory of 4880	4424	u3rw.1.exe	93
PID 4424 wrote to memory of 4880	4424	u3rw.1.exe	93
PID 4880 wrote to memory of 3636	4880	cmd.exe	95
PID 4880 wrote to memory of 3636	4880	cmd.exe	95
PID 4880 wrote to memory of 3636	4880	cmd.exe	95
PID 4880 wrote to memory of 3980	4880	cmd.exe	96
PID 4880 wrote to memory of 3980	4880	cmd.exe	96
PID 4880 wrote to memory of 3980	4880	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\0141234b91988ec9abae7f93fa083835.exe
"C:\Users\Admin\AppData\Local\Temp\0141234b91988ec9abae7f93fa083835.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4892
- C:\Users\Admin\AppData\Local\Temp\u3rw.0.exe
  "C:\Users\Admin\AppData\Local\Temp\u3rw.0.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:4656
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4656 -s 1984
    3⤵
    - Program crash
    PID:964
- C:\Users\Admin\AppData\Local\Temp\u3rw.1.exe
  "C:\Users\Admin\AppData\Local\Temp\u3rw.1.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4424
- - 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:4880
  - - C:\Windows\SysWOW64\chcp.com
      chcp 1251
      4⤵
      PID:3636
  - - 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:3980
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4892 -s 1160
  2⤵
  - Program crash
  PID:2568

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 4892 -ip 4892
1⤵
PID:4760

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 4656 -ip 4656
1⤵
PID:2744

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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u3rw.0.exe

Path C:\Users\Admin\AppData\Local\Temp\u3rw.0.exe
Size 182KB
SHA256 0993d4c07d308fe8dffae59c2bcea46471d87eb128e0212a295941bd7703733e
MD5 5239ca020f7751e9d634bd89366d2ed3
SHA1 d2d782542151f94574e91d0967f9ec5edfe3ed7d
SHA512 819bf6cfcda3e490cd59d77bed2db82017b113dfa24dd69d45cab6801f7aba0ce2e51a341c4990648b23a4bbc571ad8dfd27f347dc899967ba8e3360c9745724
SSDEEP 3072:VH+kVcxpOIWfCQgwLpOx9uF79AklwKx4PlIGi:gf7OIaCodOWhhx4u
MD5 SHA1 SHA512 SSDEEP

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u3rw.1.exe

Path C:\Users\Admin\AppData\Local\Temp\u3rw.1.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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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/4424-71-0x00000000027E0000-0x00000000027E1000-memory.dmp

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memory/4424-119-0x00000000027E0000-0x00000000027E1000-memory.dmp

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memory/4424-117-0x0000000000400000-0x00000000008E2000-memory.dmp

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memory/4656-106-0x0000000000400000-0x0000000000822000-memory.dmp

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memory/4656-19-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/4656-18-0x0000000000400000-0x0000000000822000-memory.dmp

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memory/4656-17-0x0000000000AD0000-0x0000000000B04000-memory.dmp

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memory/4656-16-0x0000000000B30000-0x0000000000C30000-memory.dmp

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memory/4656-116-0x0000000000400000-0x0000000000822000-memory.dmp

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memory/4892-78-0x0000000000400000-0x0000000000840000-memory.dmp

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memory/4892-79-0x0000000000B00000-0x0000000000B67000-memory.dmp

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memory/4892-1-0x0000000000BC0000-0x0000000000CC0000-memory.dmp

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memory/4892-3-0x0000000000400000-0x0000000000840000-memory.dmp

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memory/4892-2-0x0000000000B00000-0x0000000000B67000-memory.dmp

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