isrstealer | 97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303

Analysis

max time kernel
48s
max time network
115s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
30-10-2022 13:52

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General

Target

97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe
Size

352KB
MD5

92df8946d36b23ccb370f188f3a00870
SHA1

368ad1a5c349f9ab1356a1754cb3a2743a14e865
SHA256

97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303
SHA512

245ccee63efc2c0b51e57f9cea0ae6bc3f849d956796b5237d248a2243ce70f50d5e333a0ec1bdfafa805ce9861d5bbb149e2cdfd50e0d744c7c4d0b3dbc8784
SSDEEP

6144:tnEjTltu6wuisyZDj1T5UAAeGdD6DTzysQt9YgPmG5lXgl7muy:d2tSsmN5UHNI2LjHPmGnXg

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 6 IoCs

resource	yara_rule
behavioral1/memory/1100-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1100-65-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1100-67-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1100-78-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1100-90-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1100-91-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2032-88-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2032-89-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/2032-88-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2032-89-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1468-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1468-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1468-77-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1468-79-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1468-80-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2032-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2032-87-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2032-88-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2032-89-0x0000000000400000-0x000000000041F000-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-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1448 set thread context of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1100 set thread context of 1468	1100	vbc.exe	30
PID 1100 set thread context of 2032	1100	vbc.exe	33

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1704	schtasks.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1100	vbc.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1448 wrote to memory of 1704	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	27
PID 1448 wrote to memory of 1704	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	27
PID 1448 wrote to memory of 1704	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	27
PID 1448 wrote to memory of 1704	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	27
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1448 wrote to memory of 1100	1448	97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe	29
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 1468	1100	vbc.exe	30
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33
PID 1100 wrote to memory of 2032	1100	vbc.exe	33

C:\Users\Admin\AppData\Local\Temp\97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe
"C:\Users\Admin\AppData\Local\Temp\97ed7939f368f9be51c475d0383079a9e5fbf7b20da3e3274957829356f6d303.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1448
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Update\Windows" /XML "C:\Users\Admin\AppData\Local\Temp\1580588526.xml"
  2⤵
  - Creates scheduled task(s)
  PID:1704
- 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:1100
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\vr5lNa6V4x.ini"
    3⤵
    PID:1468
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\VS2wSbjfB5.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2032

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Scripting

T1064

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Scripting

T1064

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\1580588526.xml

Filesize
1KB

MD5
575cc1d9164d1a166ef5d275ae5d3cd1

SHA1
2411deb49bb3797d6e646ff88b6774a3dca197bf

SHA256
ccf00492c5027eeb59ece5c0d4814b7b38dfe7a1d2689fd491a1ae343acf6560

SHA512
949a60646648f5a17b54af6f9b321b503f193c09798a812c08456e354a464202edf3d50ab55ac0cbfd252430d19fed96c4bfd68295744619af440c9ab9ca28a1

Download Submit
C:\Users\Admin\AppData\Local\Temp\vr5lNa6V4x.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1100-90-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1100-91-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1100-78-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1100-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1100-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1100-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1100-65-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1448-57-0x0000000074530000-0x0000000074ADB000-memory.dmp

Filesize
5.7MB

Download
memory/1448-69-0x0000000074530000-0x0000000074ADB000-memory.dmp

Filesize
5.7MB

Download
memory/1448-54-0x00000000758B1000-0x00000000758B3000-memory.dmp

Filesize
8KB

Download
memory/1468-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1468-79-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1468-77-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1468-80-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1468-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2032-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2032-87-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2032-88-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2032-89-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads