isrstealer | a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68

General

Target

a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe
Size

1005KB
MD5

2d7e8e8cdeeaca9f5027dee94d7c1d5d
SHA1

676ce435617ad00f570feaef0074c30d0526ba4b
SHA256

a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68
SHA512

54ffa24395e8dd73dd0bb448c15b53ad465254ab694a924919d2aab297381ed39d1a01da77d1192c90e0816b4e80abc5d445966a1efa5f75bbfcb6cd8677d93b
SSDEEP

24576:YgWEXtey6BxhWU5951duuNACzX/QmLTt2Dp49JRxkHOh:/WWoBHx51dBNAit2N49Nk

Score

10^/10

isrstealer collection stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/3816-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3816-146-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3816-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3816-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4064-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4064-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/4064-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4064-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3976-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3976-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3976-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3976-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4064-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4064-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4064-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4064-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4284 set thread context of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 3816 set thread context of 3976	3816	vbc.exe	82
PID 3816 set thread context of 4064	3816	vbc.exe	84

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3816	vbc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 4284 wrote to memory of 3816	4284	a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe	81
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 3976	3816	vbc.exe	82
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84
PID 3816 wrote to memory of 4064	3816	vbc.exe	84

C:\Users\Admin\AppData\Local\Temp\a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe
"C:\Users\Admin\AppData\Local\Temp\a98b92e0f48f383d15b39290e98069fb13ec3bc52451cbc927b6988e99126f68.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4284
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3816
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Dqj9Jaf9FF.ini"
    3⤵
    PID:3976
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\6Y3uVdCUuI.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4064

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Dqj9Jaf9FF.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/3816-146-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3816-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3816-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3816-148-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3976-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3976-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3976-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3976-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4064-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4064-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4064-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4064-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4284-132-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/4284-138-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download
memory/4284-133-0x0000000074880000-0x0000000074E31000-memory.dmp

Filesize
5.7MB

Download

Analysis

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