4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693

General

Target

4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
Size

387KB
MD5

6a83e0018512174846a87c577db58ba2
SHA1

91e67bb940eb4736aca57e93f9251cc21816e7fd
SHA256

4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693
SHA512

52032a277a6c5f204efce6b122c453c08bcc9bb47b1f486d27a328e197163f24abef622744879dadc69ea4d771e4b1f8e925c6556014d9177f0e5dad12dd9a85
SSDEEP

6144:/rTfUHeeSKOS9ccFKk3Y9t9YZjuiYz1MpA5nL:/n8yN0Mr8ZjtI1z5nL

Score

9^/10

Malware Config

Signatures

UPX dump on OEP (original entry point) 20 IoCs

resource	yara_rule
behavioral1/files/0x0033000000015cdf-3.dat	UPX
behavioral1/memory/2400-8-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2400-11-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-13-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-16-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-17-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-18-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-21-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-28-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-29-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-37-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-38-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-44-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-45-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-52-0x0000000004600000-0x00000000058A9000-memory.dmp	UPX
behavioral1/memory/2760-53-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-55-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-63-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-64-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral1/memory/2760-76-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
2760	Isass.exe

Loads dropped DLL 2 IoCs

pid	Process
2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.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-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
2760	Isass.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2400 wrote to memory of 2760	2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	28
PID 2400 wrote to memory of 2760	2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	28
PID 2400 wrote to memory of 2760	2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	28
PID 2400 wrote to memory of 2760	2400	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	28

C:\Users\Admin\AppData\Local\Temp\4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
"C:\Users\Admin\AppData\Local\Temp\4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2400
- C:\Users\Public\Microsoft Build\Isass.exe
  "C:\Users\Public\Microsoft Build\Isass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  PID:2760

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
387KB

MD5
6a83e0018512174846a87c577db58ba2

SHA1
91e67bb940eb4736aca57e93f9251cc21816e7fd

SHA256
4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693

SHA512
52032a277a6c5f204efce6b122c453c08bcc9bb47b1f486d27a328e197163f24abef622744879dadc69ea4d771e4b1f8e925c6556014d9177f0e5dad12dd9a85

Download Submit
memory/2400-15-0x0000000004520000-0x00000000057C9000-memory.dmp

Filesize
18.7MB

Download
memory/2400-8-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2400-9-0x0000000004520000-0x00000000057C9000-memory.dmp

Filesize
18.7MB

Download
memory/2400-11-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2400-12-0x0000000004520000-0x00000000057C9000-memory.dmp

Filesize
18.7MB

Download
memory/2760-28-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-38-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-16-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-17-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-18-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-21-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-13-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-29-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-37-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-14-0x00000000003B0000-0x00000000003B1000-memory.dmp

Filesize
4KB

Download
memory/2760-44-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-45-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-52-0x0000000004600000-0x00000000058A9000-memory.dmp

Filesize
18.7MB

Download
memory/2760-53-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-54-0x0000000004600000-0x00000000058A9000-memory.dmp

Filesize
18.7MB

Download
memory/2760-55-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-63-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-64-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/2760-76-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads