bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e

General

Target

bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe
Size

216KB
MD5

49a21a87f5b39acab9a20a104f02e7b6
SHA1

4672aee46df932707920206e0b291ada977c124f
SHA256

bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e
SHA512

072d1c4de957d93255ed81ffc10031fcf5110e40306d6dd9c7cba30920cf16c1edd0724b8c19dcff65ed043eb45823a04cdaf30c5e84cf4419622d5d4a757690
SSDEEP

3072:SPUHpiKT2t2UHIu05W7SAFJJOUD9cckiKop97f3r8n9t9Ygntw+:/rTfUHeeSKOS9ccFKk3Y9t9YZ+

Score

9^/10

Malware Config

Signatures

UPX dump on OEP (original entry point) 20 IoCs

resource	yara_rule
behavioral2/files/0x00090000000233de-2.dat	UPX
behavioral2/memory/392-4-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-6-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/392-5-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-8-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-9-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-12-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-13-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/files/0x0001000000022742-14.dat	UPX
behavioral2/memory/1736-17-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-18-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-26-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-27-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-33-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-34-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-41-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-42-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-53-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-54-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1736-63-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
1736	Isass.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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2177723727-746291240-1644359950-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
392	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe
392	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe
1736	Isass.exe
1736	Isass.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 392 wrote to memory of 1736	392	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe	85
PID 392 wrote to memory of 1736	392	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe	85
PID 392 wrote to memory of 1736	392	bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe	85

C:\Users\Admin\AppData\Local\Temp\bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe
"C:\Users\Admin\AppData\Local\Temp\bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:392
- C:\Users\Public\Microsoft Build\Isass.exe
  "C:\Users\Public\Microsoft Build\Isass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  PID:1736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe

Filesize
725KB

MD5
4c419c91ab54eca6a1968f316191cb5a

SHA1
db96d87d7cf95e1352a845ae01c6d5ee891608aa

SHA256
71cc7212e194ea82d57f7376e1a4de7bf159cdfba57121c6e90695ae857766fc

SHA512
3991bac5b3fb1028ef623317637c51c208bb29f7a4d15aeba43c02029deaee831c5341a7d225d8a5f687475e7fa9c871b656b13fd04f28ecbd07f8acf75fcc41

Download Submit
C:\Users\Public\Microsoft Build\Isass.exe

Filesize
216KB

MD5
49a21a87f5b39acab9a20a104f02e7b6

SHA1
4672aee46df932707920206e0b291ada977c124f

SHA256
bfc21c49c19a898c9fd39001e721c03634ebd0fb7a800170e20a74f61177164e

SHA512
072d1c4de957d93255ed81ffc10031fcf5110e40306d6dd9c7cba30920cf16c1edd0724b8c19dcff65ed043eb45823a04cdaf30c5e84cf4419622d5d4a757690

Download Submit
memory/392-4-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/392-5-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-17-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-27-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-9-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-12-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-13-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-7-0x0000000001A50000-0x0000000001A51000-memory.dmp

Filesize
4KB

Download
memory/1736-6-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-18-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-26-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-8-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-33-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-34-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-41-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-42-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-53-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-54-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1736-63-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads