buer | b298ead0400aaf886dbe0a0720337e6f2efd5e2a3ac1a7e7da54fc7b6e4f4277

Target

sprintopen.exe
Size

80KB
MD5

e91d1087dc9767e75f14b335c8d88233
SHA1

ddafa725ecd7b2a59bef559904a45d379f593bc7
SHA256

b298ead0400aaf886dbe0a0720337e6f2efd5e2a3ac1a7e7da54fc7b6e4f4277
SHA512

e7e38ada160ac79ba3204700a7c92cb3fb48cde6936545007bdca8d0b60692a7b8c6baa1fea3c0127293733046712d479efb3d8793541f71a786cef018780b5d

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

uskatoinaloffice.com

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1364-3-0x0000000040000000-0x0000000040009000-memory.dmp	buer
behavioral1/memory/1364-4-0x0000000040005DA8-mapping.dmp	buer
behavioral1/memory/1364-5-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
748	sprintopen.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 748 set thread context of 1364	748	sprintopen.exe	29

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
748	sprintopen.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 748 wrote to memory of 1364	748	sprintopen.exe	29
PID 748 wrote to memory of 1364	748	sprintopen.exe	29
PID 748 wrote to memory of 1364	748	sprintopen.exe	29
PID 748 wrote to memory of 1364	748	sprintopen.exe	29
PID 748 wrote to memory of 1364	748	sprintopen.exe	29

C:\Users\Admin\AppData\Local\Temp\sprintopen.exe
"C:\Users\Admin\AppData\Local\Temp\sprintopen.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:748
- C:\Users\Admin\AppData\Local\Temp\sprintopen.exe
  "C:\Users\Admin\AppData\Local\Temp\sprintopen.exe"
  2⤵
  PID:1364

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1364-3-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download
memory/1364-5-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download

Resubmissions

Analysis

Sharing

General