23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60

General

Target

23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe
Size

211KB
MD5

7f67a1627913227cfb3e27af06da2a4c
SHA1

ccab8bb115deac47d6c50d10f998b9e9eb2021f9
SHA256

23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60
SHA512

8cf00bdc17b4c1dfe1c9a28955a6562b73dd1ea250738efc3936b2c1d1111115830f305ee0435bfb229d8e1804fc38e8f0a62dd4e47b6e3cf292d5eb72d821cf
SSDEEP

3072:EPUHpiKT2t2UHIu05W7SAFJJOUD9cckiKop97f3r8n9t9Ygnt:9rTfUHeeSKOS9ccFKk3Y9t9Y

Score

9^/10

Malware Config

Signatures

UPX dump on OEP (original entry point) 19 IoCs

resource	yara_rule
behavioral1/files/0x000b0000000149f5-1.dat	UPX
behavioral1/memory/948-10-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/948-9-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-12-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-15-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-16-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-19-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-20-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-27-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-28-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-36-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-37-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-43-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-44-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-51-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-53-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-61-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-62-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1468-74-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
1468	Isass.exe

Loads dropped DLL 2 IoCs

pid	Process
948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe
948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.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\USER\S-1-5-21-3627615824-4061627003-3019543961-1000\Software\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe
1468	Isass.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 948 wrote to memory of 1468	948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe	28
PID 948 wrote to memory of 1468	948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe	28
PID 948 wrote to memory of 1468	948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe	28
PID 948 wrote to memory of 1468	948	23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe	28

C:\Users\Admin\AppData\Local\Temp\23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe
"C:\Users\Admin\AppData\Local\Temp\23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:948
- C:\Users\Public\Microsoft Build\Isass.exe
  "C:\Users\Public\Microsoft Build\Isass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  PID:1468

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

\Users\Public\Microsoft Build\Isass.exe

Filesize
211KB

MD5
7f67a1627913227cfb3e27af06da2a4c

SHA1
ccab8bb115deac47d6c50d10f998b9e9eb2021f9

SHA256
23376b4cb6f398f275d3a42ee93cecb2d0a4df77ef25dd242bd1f33e5935fa60

SHA512
8cf00bdc17b4c1dfe1c9a28955a6562b73dd1ea250738efc3936b2c1d1111115830f305ee0435bfb229d8e1804fc38e8f0a62dd4e47b6e3cf292d5eb72d821cf

Download Submit
memory/948-14-0x00000000046D0000-0x0000000005978000-memory.dmp

Filesize
18.7MB

Download
memory/948-10-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/948-9-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/948-11-0x00000000046D0000-0x0000000005978000-memory.dmp

Filesize
18.7MB

Download
memory/1468-20-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-37-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-15-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-16-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-19-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-12-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-27-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-28-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-36-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-13-0x00000000003B0000-0x00000000003B1000-memory.dmp

Filesize
4KB

Download
memory/1468-43-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-44-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-51-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-52-0x00000000045C0000-0x0000000005868000-memory.dmp

Filesize
18.7MB

Download
memory/1468-53-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-61-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-62-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1468-74-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads