buer | cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a

General

Target

cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe
Size

970KB
MD5

0755ef31c82c480e6ef4fe1f3ce20bfa
SHA1

526564201b5de76ed751cad1e4b4a49e7b3a06dc
SHA256

cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a
SHA512

b012d68899b827cd37845c8667f128d31d23622cf9abf24b5247c4085996838576a169065dce0eada6e2dfa59879e8fbd246348a695ceb6eb975202721845170
SSDEEP

24576:cUuCGvy7Ht1JRrm8UUx4iQ99DnocClngO0ZUIlqjyn9:t3ZMKgOdIlqW9

Score

10^/10

buer stealc discovery loader spyware stealer

Malware Config

Extracted

Family

stealc

C2

http://bidbur.com

Attributes

url_path
/b5c586aec2e1004c.php

rc4.plain

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer
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-1-5-21-2231940048-779848787-2990559741-1000\Control Panel\International\Geo\Nation	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe

Loads dropped DLL 2 IoCs

pid	Process
1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe
1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe

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 4 IoCs

pid	pid_target	Process	procid_target
1808	1516	WerFault.exe	83
1168	1516	WerFault.exe	83
3884	1516	WerFault.exe	83
2264	1516	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	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2160	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe
1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1516 wrote to memory of 1200	1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe	99
PID 1516 wrote to memory of 1200	1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe	99
PID 1516 wrote to memory of 1200	1516	cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe	99
PID 1200 wrote to memory of 2160	1200	cmd.exe	103
PID 1200 wrote to memory of 2160	1200	cmd.exe	103
PID 1200 wrote to memory of 2160	1200	cmd.exe	103

C:\Users\Admin\AppData\Local\Temp\cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe
"C:\Users\Admin\AppData\Local\Temp\cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1516
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1516 -s 2092
  2⤵
  - Program crash
  PID:1808
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1516 -s 2184
  2⤵
  - Program crash
  PID:1168
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\cb1126880424c9ac5d6488b7407e0e58755f50ab7faed8a2374d390b3609f00a.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1200
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:2160
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1516 -s 140
  2⤵
  - Program crash
  PID:3884
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1516 -s 156
  2⤵
  - Program crash
  PID:2264

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 1516 -ip 1516
1⤵
PID:2780

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1516 -ip 1516
1⤵
PID:3584

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1516 -ip 1516
1⤵
PID:5108

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 1516 -ip 1516
1⤵
PID:4572

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
C:\ProgramData\mozglue.dll

Filesize
593KB

MD5
c8fd9be83bc728cc04beffafc2907fe9

SHA1
95ab9f701e0024cedfbd312bcfe4e726744c4f2e

SHA256
ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

SHA512
fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

Download Submit
C:\ProgramData\nss3.dll

Filesize
2.0MB

MD5
1cc453cdf74f31e4d913ff9c10acdde2

SHA1
6e85eae544d6e965f15fa5c39700fa7202f3aafe

SHA256
ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

SHA512
dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

Download Submit
memory/1516-0-0x0000000002190000-0x0000000002191000-memory.dmp

Filesize
4KB

Download
memory/1516-1-0x0000000002420000-0x000000000243C000-memory.dmp

Filesize
112KB

Download
memory/1516-2-0x0000000010000000-0x000000001022D000-memory.dmp

Filesize
2.2MB

Download
memory/1516-3-0x0000000010000000-0x00000000100F7000-memory.dmp

Filesize
988KB

Download
memory/1516-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

Filesize
972KB

Download
memory/1516-71-0x0000000010000000-0x00000000100F7000-memory.dmp

Filesize
988KB

Download
memory/1516-72-0x0000000002190000-0x0000000002191000-memory.dmp

Filesize
4KB

Download
memory/1516-73-0x0000000010000000-0x000000001022D000-memory.dmp

Filesize
2.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads